fastapi / fastapi

FastAPI is a Python web framework for building APIs using standard type hints, with automatic OpenAPI and JSON Schema documentation.

nautechsystems / nautilus_trader

Rust-native, event-driven engine for backtesting and live trading across multiple asset classes and venues, with Python strategy control.

apache / iggy

Persistent message streaming platform written in Rust, served over QUIC, WebSocket, TCP, and HTTP transports.

lionsoul2014 / ip2region

Offline IP-to-region lookup library and data management framework supporting IPv4 and IPv6 with xdb query clients.

nginx / nginx

Official source repository for NGINX Open Source, a high-performance web server, reverse proxy, load balancer, and content cache.

juspay / hyperswitch

Open-source, self-hostable payments infrastructure in Rust that connects to many payment processors and offers routing, vault, and reconciliation modules.

tigerbeetle / tigerbeetle

A distributed database for financial transactions, built around debit/credit primitives with a consensus-replicated storage engine.

flowable / flowable-engine

Java workflow engine that executes BPMN processes, CMMN cases, and DMN decision rules, embeddable or runnable as a server.

trinodb / trino

Distributed SQL query engine for big data analytics across many data sources, formerly known as PrestoSQL.

mastodon / mastodon

Self-hosted, federated social network server implementing ActivityPub for publishing posts, media, and following users across servers.

kimai / kimai

Self-hostable web time-tracking application for timesheets, reports, invoices, and team management.

invoiceninja / invoiceninja

Source-available invoicing app for invoices, quotes, projects, expenses, and time tracking, built on Laravel and offered hosted or self-hosted.

apache / couchdb

Apache CouchDB is a document database with multi-primary replication and a JSON-over-HTTP API.

apache / fineract

Open-source core banking platform providing a extensible foundation for financial services like loans, savings, and group lending.

erlang / otp

Erlang programming language runtime and the OTP libraries and design principles for building fault-tolerant, soft real-time systems.

pixelfed / pixelfed

Federated, ad-free photo sharing social network built on ActivityPub and the Laravel PHP framework.

ash-project / ash

Declarative Elixir framework for defining resources, actions, and policies that generate APIs, queries, and business logic.

openhwfoundation / cvw

Wally is a configurable 5-stage pipelined RISC-V processor written in SystemVerilog, supporting RVA22 and virtual memory.

mojolicious / mojo

Perl web framework with a built-in non-blocking HTTP/WebSocket server and client, plus MVC, routing, templates, and JSON/HTML parsing.

apple / swift-crypto

Swift implementation of a large part of Apple's CryptoKit API for Linux and ARM64 Windows, backed by vendored BoringSSL and XKCP.

kgrzybek / modular-monolith-with-ddd

Reference implementation of a modular monolith in .NET using Domain-Driven Design, CQRS, and clean architecture patterns.