Open-source alternatives to Pgbouncer

This project is a Kubernetes operator designed for deploying and managing production PostgreSQL database clusters using declarative configurations. It functions as a controller that synchronizes the actual state of database clusters with a desired state, providing a system for high availability orchestration, automated backup and recovery, and containerized database administration. The operator distinguishes itself through a comprehensive data protection suite that supports point-in-time recovery, multi-mode backups to cloud object storage, and cluster cloning. It ensures continuous availabil

This project is a feature-rich Go client library designed for interacting with Redis. It serves as a comprehensive interface for managing remote data stores, enabling developers to execute standard database commands, handle complex data structures, and perform asynchronous operations within Go applications. The library distinguishes itself through its support for advanced Redis capabilities, including connection pooling, pipelining, and transactional integrity. It provides specialized primitives for managing distributed clusters, including automated topology updates and request routing to sha

Sequel is a relational database toolkit for Ruby that provides object-relational mapping, a fluent SQL query builder, and schema migration capabilities. It maps database tables to Ruby classes with support for associations, validations, lifecycle hooks, and eager loading, offering a comprehensive ORM layer for building data-centric applications. Sequel distinguishes itself through a plugin-based extension architecture that allows composable customization of models, databases, and datasets without relying on deep inheritance hierarchies. It includes a thread-safe connection pool with support f

Kingshard is a MySQL database proxy and sharding middleware that routes SQL traffic between clients and multiple database nodes. It functions as a load balancer, read-write splitter, and SQL query firewall to manage how data is accessed and distributed across a database infrastructure. The system implements data sharding using hash, range, or date strategies to split tables across multiple nodes. It enables read-write splitting by directing data modification requests to a master node while distributing read-only queries across a pool of slave replicas. The proxy provides traffic management t

Npgsql is a .NET data provider and client library that enables applications to connect, execute queries, and manage data within PostgreSQL databases. It functions as a connection manager and translation layer between the application and the database server. The project features a connection manager capable of multi-host connectivity, providing load balancing and automatic failover across multiple servers. It includes specialized support for high-volume data import and export through bulk data operations and a mapping system that translates complex database types, such as arrays and JSON, into

Sozu is a high-performance, memory-safe reverse proxy and load balancer built in Rust. It is designed to manage HTTP, TCP, and UDP traffic through a multi-process architecture that leverages isolated worker processes to ensure fault tolerance and efficient resource utilization across multi-core hardware. The project distinguishes itself through a focus on continuous availability and dynamic control. It features a unique binary hot-reloading mechanism and a Unix-socket-based control plane, allowing administrators to update proxy configurations, modify listener settings, and even replace the pr

TinyWebServer is a lightweight HTTP web server written in C++ for Linux. It is designed to handle HTTP requests and serve static content using low-level Linux system calls for network connection management. The server utilizes a state machine to parse GET and POST data from network sockets. It incorporates a MySQL database connection pool to manage reusable links and reduce the overhead of opening and closing sessions. The project covers static media streaming for images and video files, user authentication workflows for registration and login, and system activity logging via both synchronou

Slonik is a type-safe PostgreSQL client for Node.js that uses tagged template literals to ensure parameters are bound and protected against injection attacks. It provides a framework for connecting applications to PostgreSQL with automatic type checking for queries and database schemas. The project distinguishes itself through a specialized SQL query linter that detects invalid columns and type mismatches by verifying code against a live database schema during the development process. It also includes a high-performance binary bulk data inserter for loading large datasets using native binary

HAProxy is a high-performance TCP and HTTP proxy that distributes traffic across multiple backend servers to ensure availability and fault tolerance for critical services. It operates in either TCP or HTTP mode, with an event-driven, single-threaded reactor that handles tens of thousands of connections without context switching, and supports kernel-level data transfer to minimize memory usage and latency. What distinguishes HAProxy is its configuration-file-first design, where all load-balancing rules and runtime behavior are defined in a declarative text file parsed at startup. It embeds a L

ProxySQL is a database proxy designed to route and balance traffic between applications and MySQL or PostgreSQL servers. It provides database high availability by monitoring backend server health and automatically rerouting traffic to healthy nodes during failover events to prevent downtime. The system integrates with generative AI models by proxying requests through a protocol handler, creating a bridge that allows large language models to access structured data. The project includes capabilities for traffic management through automatic failover routing and cluster topology discovery. It op

AliSQL is a fork of MySQL by Alibaba that extends the relational database management system with enhancements for high performance, scalability, and enterprise-grade availability. It retains the core MySQL identity as a SQL-based database for storing, organizing, and retrieving structured data, while adding optimizations for large-scale transactional and analytical workloads. The project differentiates itself through a set of Alibaba-specific improvements, including a columnar engine for accelerating analytical queries directly on MySQL tables, and a distributed, shared-nothing NDB Cluster en

Pingora is a Rust-based framework for building high-performance network services, including HTTP reverse proxies, layer seven load balancers, and TLS termination proxies. It serves as an asynchronous network library designed to intercept and route HTTP, gRPC, and WebSocket traffic between clients and upstream backend servers. The project enables zero-downtime service updates by handing over listening sockets between processes during binary or configuration upgrades. It utilizes a programmable multi-phase pipeline to modify request and response bodies and headers, and it provides a pluggable T

Moleculer is a Node.js microservices framework designed for building distributed systems. It functions as a distributed service broker, task orchestrator, and service mesh framework, enabling a decentralized architecture with built-in service discovery and load balancing. The project differentiates itself through a pluggable transport layer supporting protocols such as NATS, Redis, TCP, and Kafka, as well as a dedicated microservices API gateway that maps external HTTP and WebSocket requests to internal service actions. It includes built-in fault tolerance mechanisms, including circuit breake

Endless is a zero-downtime server wrapper and process manager for Go HTTP servers. It replaces standard library listeners to coordinate process transitions and socket management, allowing binaries to be updated without dropping active network connections. The project enables zero-downtime restarts by forking a new child process to take over network sockets before the parent process shuts down. It manages secure traffic flow by wrapping servers with TLS encryption layers and supports coordination for both standard network ports and Unix sockets. The system handles the server lifecycle through

NATS Server is a high-performance, lightweight messaging system designed for cloud-native applications, edge computing, and distributed microservices. It functions as a distributed publish-subscribe broker that routes messages using hierarchical, dot-separated subject strings, enabling decoupled communication between services without requiring centralized broker lookups. The system supports core messaging patterns including asynchronous publish-subscribe, request-reply, and load-balanced queue processing. The platform distinguishes itself through a decentralized architecture that eliminates t

This project is a comprehensive library of reference implementations and patterns for building web applications using the Go Fiber framework. It provides curated templates and implementation guides for creating REST APIs, web servers, and structured backend services. The repository serves as a practical resource for applying architectural patterns, including Clean and Hexagonal architectures, as well as port-and-adapter decoupling. It offers detailed examples for integrating common web features such as OAuth2 authentication, JWT verification, WebSockets for real-time communication, and server

asyncpg is an asynchronous database driver and binary protocol client for PostgreSQL. It provides a non-blocking interface for executing SQL statements, streaming result sets, and managing data transfer between an application and a PostgreSQL database. The driver implements the PostgreSQL binary protocol directly to facilitate efficient data transfer and type conversion. It includes a connection pool to maintain and reuse open database connections, reducing the latency associated with repeated handshakes. The project covers a broad range of database integration capabilities, including atomic

Pgcat is a PostgreSQL middleware solution providing connection pooling, sharding, load balancing, and failover management. It functions as a proxy that optimizes resource usage and scalability by managing database sessions and distributing queries across multiple instances. The system distinguishes itself through traffic mirroring, which duplicates live production queries to test databases for validation. It also implements a sharding proxy to distribute data and queries across multiple database instances based on sharding keys. The project covers high availability through automated failover

Kore is an event-driven web and WebSocket server framework designed for building high-performance web services and APIs in C or Python. It functions as a secure, concurrent application framework that utilizes non-blocking I/O and isolated worker processes to handle high-concurrency traffic. The project is distinguished by a security-first architecture that features OS-level process sandboxing, privilege separation, and the isolation of private encryption keys into dedicated processes. It enables zero-downtime deployments through dynamic module hot-reloading and provides automated TLS certific

This project is an asyncio database abstraction layer that provides a common interface for performing non-blocking database operations in Python. It functions as an asynchronous database driver wrapper and a SQL expression builder, allowing for the construction of raw SQL strings from structured Python objects. The library includes an asyncio connection pool manager that utilizes task-local storage to handle connection lifecycles and reduce resource overhead. It also serves as an async database transaction manager, wrapping operations in atomic transactions and savepoints to maintain data int

Apache Tomcat is an open-source implementation of the Jakarta Servlet, Pages, Expression Language, and WebSocket specifications, serving as a container for running Java web applications. It provides a modular architecture with a servlet container, connector abstraction for multiple I/O models, and a pipeline-based request processing system that handles cross-cutting concerns through composable components. The server supports container-managed security with configurable realms for authentication against JDBC, LDAP, or memory-based credential stores, and offers TLS encryption with optional Open

The MongoDB Node.js Driver is a programmatic interface and NoSQL database client used to manage document storage and execute operations within a MongoDB database. It serves as an asynchronous database interface and connection manager that enables Node.js applications to integrate with MongoDB servers. The project implements client-side field encryption to secure sensitive data and queries locally before transmission. It also provides a BSON serialization library to convert JavaScript objects into a binary format for efficient storage and network transmission. The driver covers a broad range

This project is a reference implementation of a production-ready backend API built with Rust and the Actix-Web framework. It serves as a codebase demonstrating the development of a newsletter subscription service, encompassing the management of subscriber sign-ups, email confirmations, and campaign delivery. The project highlights a layered architecture that separates concerns into handler, service, and repository layers. It utilizes an actor-based concurrency model for handling HTTP requests and employs trait-based abstractions to decouple business logic from external dependencies, such as e

This project is a reference implementation of a distributed system built using Spring Cloud Alibaba, Spring Boot, and JDK 17. It serves as a comprehensive model for implementing a microservices architecture. The system integrates a wide range of distributed patterns, including global transaction coordination for data consistency, OAuth2 and JWT for identity management, and Kubernetes-based container orchestration. It features a dedicated observability stack for distributed request tracing, log aggregation, and service health monitoring. The implementation covers several functional domains, i

Tengine is an enhanced Nginx web server distribution designed for high-traffic environments. It functions as a high-performance reverse proxy, dynamic load balancer, and HTTP/3 proxy server, integrating an embedded Lua scripting engine to allow for custom business logic and dynamic request processing. The project distinguishes itself through a focus on modern transport protocols and efficiency, featuring native support for QUIC and HTTP/3 to reduce connection latency. It implements userspace UDP forwarding to bypass the kernel for higher throughput and provides the ability to dynamically upda

Mosn is a multi-protocol network proxy designed for cloud-native service meshes, API gateway management, and distributed load balancing. It forwards layer four and layer seven traffic across diverse network protocols to ensure interoperability between distributed cloud components. The project is distinguished by its ability to perform zero-downtime proxy updates, replacing the running binary while maintaining existing network connections. It further supports dynamic proxy extension, allowing custom request processing logic to be added via external plugins or compiled Go modules without restar

libwebsockets is an event-driven networking framework written in C. It provides a suite of tools for implementing HTTP servers and clients, WebSocket bidirectional communication, MQTT client messaging, and TLS-enabled socket encryption. The project distinguishes itself through a non-blocking event-loop architecture capable of scaling to high connection volumes by distributing network sessions across multiple service threads. It uses a protocol-based callback system and a pluggable event loop integration that allows the networking core to synchronize with external system event libraries. The