Open Source Blockchain Software

The ccxt library is a collection of available crypto exchanges or exchange classes. Each class implements the public and private API for a particular crypto exchange. All exchanges are derived from the base Exchange class and share a set of common methods. To access a particular exchange from ccxt library you need to create an instance of corresponding exchange class. Supported exchanges are updated frequently and new exchanges are added regularly.

Jesse is an open-source AI agent framework designed to help developers build and orchestrate intelligent workflows that combine large language models (LLMs) with external tools, automation logic, and real-world actions. It acts as an agent manager where you can define tasks, contexts, and tool integrations so that AI reasoning is reliably connected to deterministic procedures like API calls, data retrieval, and task execution. Jesse emphasizes structured outputs, safety boundaries, and explainable reasoning, helping users design agents that don’t just hallucinate responses but can coordinate steps, validate conditions, and interact with systems predictably. It also includes built-in support for evaluation, logging, and orchestration so developers can monitor, test, and improve agent behavior over time. Because it’s framework-agnostic with respect to model providers, Jesse can work with different LLM backends, giving teams flexibility in cost and capability trade-offs.

BitcoinSuite is a Java based graphical user interface for Bitcoin, a peer-to-peer decentralized cryptocurrency. It is a direct fork of open source project NamecoinJ at http://sourceforge.net/p/namecoinj/. Donations are welcome: BTC: 1PqYXpLLSeAHz3FiZmPcfr451jnzsGgXbc, NMC: N2TFbwpTNhNLeXaBD8FSBbicb6guQNXUiA

Catalyst is an algorithmic trading library for crypto-assets written in Python, originally developed to let quants and developers design, backtest, and deploy trading strategies in a unified environment. It builds on top of Zipline, extending that ecosystem to support crypto exchanges and high-resolution historical data (daily and minute bars). Users can express strategies in Python, run backtests against historical price data, and analyze performance through built-in metrics and analytics to evaluate profitability, risk, and behavior under different market conditions. Beyond backtesting, Catalyst was designed to support live trading on multiple crypto exchanges such as Binance, Bitfinex, Bittrex, and Poloniex, bridging simulation and production within the same framework. The library includes a rich set of examples, Docker and conda configurations, and integration points for community resources like forums and Discord for sharing strategies and troubleshooting.

NamecoinJ is a Java based graphical user interface for Namecoin, a peer-to-peer Domain Name System based on Bitcoin technology (a decentralized cryptocurrency). Donations are welcome: BTC: 19o81NGAHpBmVXkfUcxSttwnBsBnLK9hS3, NMC: Mx3hanF6qXywPAyrAU4S14CwXYcMnecaai

O3 Wallet is java based Bitcoin Wallet software built on BitcoinJ. We are heavily focused on design and use cases. Note: We are not uploading new versions here. Follow our website for latest version!!

100% FREE / open source / PRIVATE cryptocurrency portfolio tracker. Email / text / alexa / telegram price alerts, price charts, mining calcs, leverage / gain / loss / balance stats, news feeds +more. Privately track Bitcoin / Ethereum / unlimited cryptocurrencies. Customize as many assets / markets / alerts / charts as you want. Over 50 Exchanges / 40 Trading Pairs Supported (exchanges / pairings list at bottom of README.txt): https://tinyurl.com/ct-readme Nearly Unlimited Assets Supported (any on supported exchanges). Demo: https://dragonfrugal.org/open-crypto-tracker MINIMUM specs: 1 Ghz CPU / 512 Mb RAM / Quality 16 Gb MicroSD / Nginx or Apache headless / PHP v7.2+ Debian-based Auto-Install ("Terminal" app in your system menu, or over remote SSH): (RECOMMENDED WAY TO PRIVATELY / CHEAPLY USE APP ON INTERNAL / HOME NETWORK) wget --no-cache -O FOLIO-INSTALL.bash https://tinyurl.com/install-crypto-tracker chmod +x FOLIO-INSTALL.bash sudo ./FOLIO-INSTALL.bash

A library for secure smart contract development. Build on a solid foundation of community-vetted code. OpenZeppelin Contracts uses semantic versioning to communicate backward compatibility of its API and storage layout. To keep your system secure, you should always use the installed code as-is, and neither copy-paste it from online sources nor modify it yourself. The library is designed so that only the contracts and functions you use are deployed, so you don't need to worry about it needlessly increasing gas costs. Reduce the risk of vulnerabilities in your applications by using standard, tested, community-reviewed code.

Shardeum is an EVM‑compatible layer‑1 blockchain platform that leverages dynamic state sharding to deliver linear scalability, consistently low transaction fees, strong decentralization, and high throughput for decentralized application developers. Shardeum is an innovative EVM-compliant blockchain platform that leverages dynamic state sharding to achieve unprecedented scalability. By implementing a sharding model, Shardeum ensures faster processing times and lower transaction costs without compromising security or decentralization. Horizontal scalability through sharding. Advanced cryptographic techniques and robust consensus protocols. Truly decentralized network with no single point of failure.

the cryptik project (source, wiki, and tickets) have been moved off of sourceforge due to sourceforge's software bundling policy. Please see our new project home at https://g.dradux.com/dradux/cryptik for the latest code ---- Cryptik is a python application for querying various exchanges (btc-e, crypto-trade, kraken, bitcoinaverage, etc.) to get the current price for various cryptocurrencies (bitcoin, litecoin, primecoin, etc.). Supported Exchanges: * BTC-E * Coinbase * BitCoinAverage * CryptoTrade * KRAKEN * CAVIRTEX * MTGOX * VIRCUREX * BitStamp * CampBX * Cryptsy Supported CryptoCurrencies: * BTC * LTC * FTC * PPC * NMC * XPM * PPC * WDC * UTC

rate.sx is a command-line-friendly cryptocurrency rate service designed to be queried with curl or a browser, returning clean text or minimal markup. It emphasizes human-readable output by default, with options for concise one-liners or richer summaries including sparkline-style ASCII charts. The service supports multiple coins, fiat conversions, and historical lookups so you can compare prices over time without leaving the terminal. Under the hood it aggregates price feeds and normalizes the results for robust querying, yet keeps the interface dead simple. Because it’s HTTP-based, you can integrate it into shell prompts, tmux status lines, CI logs, dashboards, or chat bots. It’s ideal for developers and power users who want quick answers and scriptable endpoints without installing a heavy client.