Open Source Finance & Fintech Tools

autumn

stars 2.8Kforks 274

Open-source billing layer over Stripe for usage and credits

invoiceninja

stars 10.3Kforks 2.7K

Self-hosted invoicing, expenses, and time tracking

tradingview-mcp

stars 6.8Kforks 2.8K

MCP bridge for AI-assisted TradingView chart analysis

MiroFish

stars 78.2Kforks 11.9K

Multi-agent simulation engine that predicts real-world outcomes

CloddsBot

stars 3Kforks 354

AI trading agent for crypto, DeFi, and prediction markets

FckSignups

stars 4.5Kforks 258

Open-source tools that work instantly, no signup required

fmt

stars 25.9Kforks 3.1K

Fast, type-safe C++ formatting that replaces printf and iostreams

SlowBooks-Pro-2026

stars 563forks 100

Full-featured local bookkeeping: no cloud, no subscription

securo

stars 4Kforks 540

Self-hosted money manager with bank sync and AI agents.

OpenCompany

stars 993forks 151

Self-hosted AI agent canvas for every business function

nautilus_trader

stars 29.9Kforks 4K

Rust-native trading engine with research-to-live parity