Open-source alternatives to Certd

Lego is an ACME certificate manager and lifecycle tool used to automate the request, renewal, and revocation of SSL and TLS certificates. It implements the ACME protocol to communicate with compliant certificate authorities and manages the full issuance process, including account registration and private key rollovers. The project distinguishes itself through extensive DNS automation, utilizing a provider-based abstraction to solve DNS-01 challenges across various third-party DNS providers. It supports advanced verification workflows such as CNAME-based challenge delegation, DNS zone discover

Automate SSL/TLS certificates on Windows with ease

This project is a command-line tool for managing public key infrastructure and digital identities. It provides a comprehensive suite for X.509 certificate lifecycle management, including the generation, signing, renewal, and revocation of certificates and signing requests. The tool distinguishes itself through specialized security capabilities such as binding cryptographic credentials to TPMs and HSMs for hardware-backed identity attestation. It also provides dedicated support for machine identity security, using short-lived SSH certificates and mTLS to secure non-human workloads. Broad capa

Dehydrated is a shell-script ACME client that automates the lifecycle of TLS certificates from certificate authorities like Let's Encrypt. It implements the ACME protocol entirely in POSIX shell script with no external dependencies beyond standard Unix tools, relying on OpenSSL for all cryptographic operations including key generation, signing, and certificate parsing. The tool manages account keys, certificates, and configuration as plain files on disk, maintaining certificate metadata and account status in simple text files without a database. It delegates domain validation challenges to us

acme-tiny is a minimal ACME client implemented as a single-file Python script that automates obtaining and renewing SSL/TLS certificates from a Certificate Authority using the Automated Certificate Management Environment (ACME) protocol. It relies on OpenSSL command-line tools for key generation and certificate signing request creation, and uses file-based HTTP validation to verify domain ownership by placing a token file on the web server. Designed for fully automated certificate lifecycle management, acme-tiny is intended to be executed periodically by a system scheduler like cron, checking

This project is a Kubernetes controller that automates the issuance, renewal, and lifecycle management of TLS certificates. It functions as a native extension to the cluster API, using custom resource definitions and reconciliation loops to maintain the desired state of certificates and trust bundles across distributed services. By integrating directly with the cluster's admission control and secret storage systems, it ensures that cryptographic identities are consistently provisioned and available for application workloads. The project distinguishes itself through its extensive support for a

Lucky is a connectivity and routing utility suite focused on SSL automation, dynamic DNS client services, NAT traversal, and port forwarding. It provides a network gateway management interface to coordinate public network access for internal services. The project distinguishes itself through a centralized web-based administration panel used to configure reverse proxy servers, manage ACME-based SSL certificate renewals via DNS provider APIs, and synchronize public IP addresses across multiple dynamic DNS providers. It also includes a NAT traversal tool using STUN to establish external connecti

This project is an automated SSL certificate manager and orchestrator for Nginx proxy configurations. It functions as an ACME protocol client that handles the request, issuance, and renewal of security certificates for web services running in containers. The system monitors Docker container lifecycle events to automatically provision certificates based on assigned hostnames. It automates the full certificate lifecycle, including domain ownership validation and the issuance of specialized wildcard or multi-domain certificates. The tool manages security through both HTTP and DNS challenge reso

This project is a Docker-based web gateway and Nginx reverse proxy manager. It functions as a containerized network edge designed to route incoming HTTP and HTTPS traffic to backend services using subdomains and subfolders. The system automates the procurement and renewal of Let's Encrypt SSL certificates via the ACME protocol and various DNS plugins. It includes a mechanism to export and share these certificates through persistent volumes so other containers can utilize the same encryption keys. Security is handled through a combination of server intrusion prevention, using Fail2Ban to moni

acme-dns is a DNS server and protocol manager designed to proxy TXT records for ACME DNS-01 challenges. It enables the validation of domain ownership for automated certificate issuance without exposing primary DNS zone files or credentials to external clients. The project utilizes CNAME-based delegation to offload verification from a primary zone to a specialized server. It provides a REST API for programmatically updating short-lived validation tokens, which is secured through CIDR-based network restrictions and automated TLS provisioning for the API interface. The system supports stateless

This project is a command-line tool that automates the entire lifecycle of security certificates using standard domain validation protocols. It functions as a background service to manage the issuance, renewal, and installation of certificates, ensuring that encrypted web traffic remains active without requiring manual intervention. The tool distinguishes itself through extensive support for automated domain ownership verification, including the ability to issue wildcard certificates by programmatically interacting with external domain name system providers. It provides flexible validation op

dnmp is a containerized web development environment that provisions a full LNMP stack consisting of Nginx, MySQL, PHP, and Redis. It serves as a management system for coordinating web server routing, language runtime versions, database administration, and SSL certificate provisioning within Docker containers. The project distinguishes itself through a comprehensive PHP runtime manager that allows for switching between multiple language versions and managing extensions in isolated environments. It includes an automated SSL certificate manager that uses webroot validation to provision and renew

BillionMail is a self-hosted email infrastructure and marketing platform designed to provide full control over mail delivery, domain management, and subscriber communication. It functions as a comprehensive mail server manager that enables users to deploy and maintain private email environments, including integrated webmail interfaces for direct account access. The platform distinguishes itself by combining high-volume bulk email distribution with sophisticated deliverability tools. It supports multi-tenant infrastructure provisioning, allowing administrators to manage multiple domains and ma

Maddy is a modular mail server that assembles a complete email system by connecting small, single-purpose modules through a declarative configuration file. Rather than a monolithic stack, it lets operators compose message processing, storage, authentication, and security enforcement from interchangeable building blocks, with each module handling a specific function like receiving SMTP connections, verifying credentials, or applying policy checks. The server distinguishes itself through its flexible authentication and security architecture. It delegates user verification to external systems in

cert-manager is a Kubernetes TLS certificate manager and cluster add-on that automates the issuance and renewal of TLS certificates. It functions as a certificate lifecycle automator, managing certificates as native Kubernetes resources to secure internal and external network traffic. The project includes an ACME protocol client to automate certificate requests and validations from providers. It utilizes a controller to synchronize the desired state of certificates with responses from various certificate authorities. The system covers certificate provisioning from external issuers and vault

This project is a toolkit for creating and managing X.509 certificate authorities, providing tools for the issuance, signing, and management of TLS certificates and private keys. It includes a command-line utility for generating certificate signing requests, bundling certificate chains, and parsing PEM or DER files. The system features an HTTP API server that allows for remote signing and verification of certificates using JSON requests and responses. This architecture supports automated certificate provisioning and includes a signing proxy to forward requests to remote backend services. The

This project is a public key infrastructure management system designed to automate the issuance, renewal, and revocation of X.509, TLS, and SSH certificates. It functions as a machine identity provider and certificate authority, enabling the establishment of private PKI to secure inter-service communication and remote access. The system distinguishes itself through hardware-bound identity attestation, which ties cryptographic keys to physical device silicon or TPMs to prevent credential exfiltration. It supports a wide array of identity verification mechanisms, including OIDC, cloud-provider

Vault is a centralized secrets management platform designed to secure, store, and control access to sensitive credentials such as API keys, passwords, certificates, and encryption keys. At its core, the system employs a barrier-based cryptographic sealing mechanism that requires an unseal process to decrypt internal storage, ensuring that sensitive data remains protected. It provides identity-based access control to manage granular permissions across distributed infrastructure, effectively centralizing security policies and authentication for both human and machine workloads. What distinguish

ProxySU is a Windows desktop application that automates the deployment and management of proxy services on a Linux VPS. It combines single-click installation of multiple proxy protocols, including V2ray, Xray, Trojan, and Shadowsocks, with automatic SSL/TLS certificate provisioning and renewal through Let's Encrypt. The tool distinguishes itself by handling the full lifecycle of proxy server setup from a Windows environment, using SSH key-based authentication for secure, passwordless remote access. It also includes network optimization capabilities, such as activating the BBR TCP congestion c

HestiaCP is a Linux web hosting control panel designed for the centralized administration of web servers, databases, and DNS records. It serves as a management suite for hosting email services and managing multiple PHP language runtimes for various web applications and user accounts. The project distinguishes itself through integrated security orchestration, providing a Linux firewall orchestrator with automated brute-force detection and an SSL certificate automator for the issuance and renewal of security certificates. It includes a DNS zone manager with clustering support, as well as a mail

OctoPrint is a web-based platform for remotely controlling and monitoring 3D printers. It provides a browser dashboard to start, pause, cancel, and track print jobs, while streaming real-time printer status, temperature, and progress updates. The system is built around a plugin-based architecture that allows extending core functionality, and it offers a documented REST API for programmatic printer control and data management. The platform distinguishes itself through its comprehensive automation and extensibility capabilities. It supports event-driven workflows that automatically execute cust

This project is a Docker-based Nginx reverse proxy manager designed to automate the deployment of HTTPS for web applications. It functions as a gateway that acquires and renews security certificates via Let's Encrypt and proxies incoming traffic to backend services. The system distinguishes itself by automatically discovering web services running in Docker containers to eliminate manual domain configuration. It manages security certificates through an automated process and can expose these certificates to other applications via shared volumes. The tool covers traffic management through load

YunoHost is a self-hosted server management platform designed for deploying, configuring, and maintaining a suite of open source applications on a private server. It functions as a package-based application orchestrator that installs and updates software from a curated catalog using standardized deployment scripts. The platform features a centralized identity management system using a directory service to synchronize user accounts and credentials across hosted applications for single sign-on access. It includes an integrated reverse proxy to route network traffic to backend services based on

Nginx Proxy Manager is a web-based administrative interface for configuring and managing Nginx reverse proxy hosts and server rules within Docker containers. It functions as a containerized network gateway that routes external web traffic to internal services and backend applications. The system automates the acquisition and renewal of Let's Encrypt SSL certificates to encrypt network traffic without manual command line intervention. It provides a graphical dashboard for defining proxy hosts, access lists, and custom server configurations, removing the need for manual configuration file editi

This project is a GitOps infrastructure framework designed for managing bare metal servers, container clusters, and networking. It serves as a declarative system for orchestrating the deployment and lifecycle of self-hosted services, using Git as the source of truth to synchronize the desired state of the environment. The framework differentiates itself through a comprehensive automation suite that covers the entire hardware-to-service pipeline. It includes a PXE-based bare metal provisioner for network booting and operating system installation, alongside a lightweight container orchestration

ZenML is an extensible machine learning orchestration framework designed to manage the end-to-end lifecycle of data pipelines and AI agent workflows. It functions as a durable orchestrator that executes machine learning tasks as directed acyclic graphs, ensuring that every step is containerized for consistent performance across local, cloud, and hybrid infrastructure. By decoupling pipeline code from underlying compute and storage backends, the platform allows developers to define infrastructure-agnostic stacks that remain portable across diverse environments. The project distinguishes itself

Piku is a git-based platform-as-a-service deployment tool for self-hosted application hosting. It enables the deployment of multiple web applications and background workers to private servers by automating builds and updates through git push. The system acts as an application process orchestrator and reverse proxy server manager, routing incoming HTTP traffic to specific application processes. It features a multi-language application runtime that detects programming languages from repository files to handle dependency installation and execution settings. Security is handled via an integrated