Open-source alternatives to Plain App

alt-sendme is an accountless peer-to-peer file transfer tool designed for sending files and folders directly between devices. It operates as a decentralized sharing service that utilizes portable access tickets for identity exchange instead of centralized user accounts. The project distinguishes itself through NAT and firewall traversal capabilities, using UDP hole punching and relay-based fallback routing to establish direct connections between remote devices. It supports multi-device data broadcasting, allowing a single file or folder to be shared with multiple recipients simultaneously thr

escrcpy is an Android device mirroring tool and ADB device manager that enables the display and control of Android screens on a computer via USB or network connections. It functions as a multi-device screen orchestrator, providing a visual interface to arrange and control several mirrored device windows in parallel layouts. The project distinguishes itself as an automation controller that utilizes large language models to translate natural language instructions into actionable device commands. It further differentiates its capabilities by acting as a reverse tethering client, allowing a compu

Blinko is a personal knowledge management system and an LLM-powered knowledge base that enables users to capture and organize thoughts through a bi-directional knowledge graph. It functions as a RAG-enabled note-taking application and a self-hosted Markdown editor, allowing for the creation of permanent documentation and fleeting notes. The project distinguishes itself by integrating retrieval-augmented generation to provide conversational querying and AI-powered analysis of private document libraries. It supports both cloud-based and local AI model integration, enabling users to perform sema

Syncthing Android is a mobile application and service wrapper that enables decentralized, peer-to-peer file synchronization on the Android platform. It functions as a distributed data sync tool that mirrors folders across multiple devices without the need for a central cloud server. The project provides a mobile interface to manage a synchronization instance, utilizing a service-wrapper architecture to handle the lifecycle and configuration of the underlying synchronization binary. It ensures secure data exchange through TLS encryption, certificate-based identity verification, and password-pr

SmarGate is a network utility designed as an intranet penetration tool, peer-to-peer network tunnel, and remote device management gateway. It functions as a system for bypassing NAT and firewalls to expose internal services to the public internet, while also providing SOCKS5 and HTTP proxy capabilities and SSL/TLS encrypted tunnels. The project distinguishes itself by implementing hybrid routing that combines direct peer-to-peer TCP links with cloud-based proxy relaying to reduce latency. It features real-time dynamic port mapping that allows network redirections to be updated via a mobile cl

libhv is a high-performance C/C++ network library and event-driven I/O framework used to build TCP, UDP, SSL, HTTP, WebSocket, and MQTT clients and servers. It provides a non-blocking event loop for managing network sockets, timers, and system signals across multiple threads. The project is distinguished by its integrated support for specialized network roles, including a full HTTP web server with RESTful routing and middleware, an MQTT messaging client for IoT communication, and the ability to implement SOCKS5 and HTTP proxies. It also features a reliable UDP implementation to ensure ordered

IPFS is a peer-to-peer hypermedia protocol and content-addressed storage system that identifies data by cryptographic hashes rather than network locations. It enables the creation of a decentralized web by organizing files and directories as directed acyclic graphs of linked content identifiers. The project differentiates itself through the use of a distributed hash table for locating peers and a system of signed records to map human-readable names to changing content. It also provides HTTP gateways that translate standard web requests into peer-to-peer queries, allowing decentralized data to

websocket-sharp is a C# library implementation of the WebSocket protocol used for building bidirectional client and server applications. It enables real-time data exchange between endpoints via persistent connections. The library provides specialized networking capabilities, including SSL encrypted networking for secure transport and certificate validation. It also features HTTP proxy tunneling to route traffic through intermediary servers using basic or digest authentication. The project covers a broad range of capabilities, including the implementation of both WebSocket clients and servers

httpsms is a programmable messaging platform that transforms Android hardware into a functional SMS gateway. By bridging mobile devices with web-based services, it enables bidirectional communication through a programmable interface that allows external software to send and receive text messages via HTTP requests. The platform distinguishes itself by providing a secure, automated infrastructure for managing high-volume messaging. It utilizes end-to-end payload encryption to protect sensitive data during transit and incorporates a rate-limited execution engine to regulate transmission frequenc

This project is a markdown-based personal knowledge base and digital learning journal used to store notes and summaries from books and technical literature. It serves as a reading summary repository and technical reference library for archiving key takeaways and insights from non-fiction and professional materials. The collection functions as a digital garden for curating insights from books, articles, and videos. It specifically focuses on distilling complex architectural patterns, technical concepts, and professional leadership principles into a searchable format for long-term reference. T

MiaoYan is a local Markdown editor and personal knowledge management tool. It functions as a system for writing and organizing documents stored as local files, supporting the creation of a connected information network through bidirectional links and backlinks. The project includes a specialized tool for converting Markdown documents into slide-based presentations by using specific content separators. It also provides a command-line interface for managing files, allowing users to create, search, and open documents without a graphical file explorer. The editor features a side-by-side live pre

Rayhunter is an IMSI catcher detection tool and cellular network monitor designed to identify cell-site simulators and fake base stations. It functions as an SDR signal analyzer that tracks tower connectivity, logs GPS locations, and monitors for network downgrades or disabled encryption on mobile hardware. The system distinguishes itself through heuristic-based traffic analysis used to detect suspicious identity requests, malformed system information, and the use of null ciphers. It includes a remote device management interface consisting of a REST API and web dashboard for controlling detec

This project is a native C++ desktop application for personal knowledge management. It functions as a local-first markdown note-taking tool and knowledge base, ensuring data is stored directly on the local device for offline access and user ownership. The application distinguishes itself by transforming markdown task lists into interactive kanban boards for visual workflow tracking. It also emphasizes keyboard-driven productivity, utilizing system-wide hotkeys to summon the application to the foreground and navigate its interface without a mouse. The software provides hierarchical content or

Dendron is a markdown knowledge management system designed for organizing linked files into a hierarchical personal knowledge base. It functions as a git-backed note manager that stores data as plaintext markdown files to ensure data persistence and ownership. The system distinguishes itself through schema-based organization, which applies structural templates and autocomplete hints to maintain consistency across large sets of documents. It also provides bi-directional linking and an interactive graph view to visualize relationships between notes, alongside a static site generator that export

Teldrive is a web-based cloud storage interface that uses Telegram as a backend for storing and organizing files. It functions as an encrypted cloud drive and a remote storage bridge, allowing users to manage files through a dedicated file manager. The system optimizes data throughput by using a proxy to aggregate multiple authentication tokens, which bypasses single-account rate limits to increase upload and download speeds. It ensures data privacy through per-file salt encryption for both file data and metadata. The project covers remote file management, including the ability to mount stor

Fleet is an open-source device management platform that provides centralized control over computing devices running macOS, Linux, Windows, Chromebooks, iOS, and Android. It enables organizations to enroll devices, collect real-time telemetry, enforce security compliance policies, and manage software remotely from a single system. The platform can be deployed as a single binary, run locally for testing, or scaled horizontally across cloud infrastructure on AWS, Kubernetes, GCP, or Render, with support for high availability through database replication and load balancing. The platform distingui

This project is a curated repository of technical learning materials and a personal knowledge base. It consists of version-controlled Markdown summaries covering software architecture, engineering literature, research papers, and professional talks. The collection functions as a digital garden, using bidirectional linking and cross-references to map relationships between technical concepts. Content is distilled from various sources, including technical books, conference talks, and foundational computer science papers, into concise summaries to facilitate recall and study. The system is organ

rust-libp2p is a modular peer-to-peer networking library written in Rust, implementing the libp2p specification. It provides a composable stack of transport, security, and discovery protocols that can be mixed and matched to build decentralized applications, with a central swarm manager coordinating all active connections, protocol negotiation, and peer lifecycle. The library distinguishes itself through a pluggable transport abstraction that supports TCP, QUIC, WebSocket, WebRTC, and WebTransport, enabling cross-platform operation across browsers, mobile devices, and servers. It secures ever

Emby is a self-hosted media server used for organizing and streaming personal movies, music, and photos to various devices across local and remote networks. It functions as a central hub for media library hosting, incorporating a DLNA media server for device discovery and a remote media gateway for secure external access. The system features a GPU-accelerated transcoder that converts video formats on-the-fly to ensure compatibility across different playback devices. It also includes a live TV DVR capable of streaming live television signals and scheduling recordings for later viewing. The pl

smtp4dev is a suite of tools featuring a mock SMTP server that intercepts outgoing email traffic and stores messages for inspection instead of delivering them to recipients. It includes a web-based viewer for inspecting email metadata, raw source code, and MIME structures, alongside a responsive email previewer that simulates how HTML emails appear across different viewport sizes and device layouts. The project provides a traffic analyzer to log protocol interactions and session data for debugging delivery failures. It also operates as a TLS SMTP server, supporting encrypted connections via T

DietPi is an ultra-lightweight Debian distribution and software platform purpose-built for single-board computers. It provides a minimal operating system that strips away unnecessary services to reduce CPU and RAM usage, and includes a curated software catalogue of pre-optimised applications that can be installed with a single command. The system reads a plain-text configuration file before first boot to perform unattended OS and software installation, and offers a web interface for remote system administration. What distinguishes DietPi is its comprehensive, integrated approach to turning a

TacticalRMM is a remote monitoring and management platform designed for overseeing endpoints and automating IT administration. It functions as an endpoint management tool and IT automation framework, providing a centralized dashboard for executing scripts, monitoring system health, and managing remote devices across multiple tenants. The platform distinguishes itself through a comprehensive remote administration suite that includes real-time shell access, remote file management, and registry editing. It integrates with third-party remote desktop software and provides a hierarchical policy inh

BoostNote-App is a collaborative project management tool and team documentation platform. It functions as a markdown knowledge base and document manager designed for organizing shared technical requirements and team notes. The application is delivered as an Electron desktop application, providing a cross-platform standalone installation. It employs a local-first documentation model, storing content on the local device before synchronizing changes to a remote server in the background. The platform covers shared knowledge management, collaborative technical documentation, and DevOps team coord

Legado is a digital library manager and content aggregator designed to collect, organize, and read text-based media from various online sources within a single mobile interface. It functions as a centralized platform for managing personal collections, supporting both e-book reading and the tracking of updates from multiple digital content providers. The application distinguishes itself through a modular architecture that allows users to import external source definitions, enabling the retrieval of content from diverse web-based providers. It utilizes sandboxed scripting and pattern-based extr

Dokploy is a self-hosted platform-as-a-service designed to simplify the deployment and management of containerized applications and databases. It provides a centralized control plane that decouples administrative management from application workloads, allowing users to oversee infrastructure across multiple server nodes through a unified web interface or a command-line tool. The platform distinguishes itself through an extensive library of pre-configured application templates, enabling the rapid deployment of databases, identity providers, and various productivity or development tools. It sup

RPi-Monitor is a monitoring suite designed for embedded Linux environments and single-board computers. It provides a framework for gathering real-time hardware telemetry, tracking system performance metrics, and visualizing data through a web-based dashboard. The system is built to handle long-term data persistence by utilizing fixed-size round-robin databases, ensuring historical records are maintained without exceeding storage capacity. The project distinguishes itself through its focus on embedded hardware integration and flexible deployment. It supports the monitoring of external physical

This project is a mobile device provisioning and app deployment tool used to install application binaries across multiple mobile platforms. It functions as a cross-platform testing suite that pushes binaries to various mobile architectures to verify software functionality. The tool includes a mobile device certificate manager that replaces system-level security certificates with custom versions, enabling the installation and debugging of unsigned applications. It also acts as a root-level system modifier, executing shell commands on device roots to change protected system files and security s