OpenZeppelin Contracts is a library for secure smart contract development.
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SubQuery is an Open, Flexible, Fast and Universal data indexing framework for web3. Our mission is to help developers create the decentralised products of the future.
Accept Bitcoin payments. Free, open-source & self-hosted, Bitcoin payment processor.
- bitcoin
- bitcoin-payment-gateway
- lightning-network
- payment-gateway
Open-source, non-custodial, privacy preserving Bitcoin wallet for Windows, Linux, and Mac.
Gno: An interpreted, stack-based Go virtual machine to build succinct and composable apps + gno.land: a blockchain for timeless code and fair open-source.
- gno
- gnoland
- gnolang
- bft
EthereumKit is a free, open-source Swift framework for easily interacting with the Ethereum.
Substrate Open Runtime Module Library
- rust
- substrate
An open-source EOS wallet project
An open-source EOS wallet project
Ultra high-performance secp256k1 ECC engine | Python, Node.js, Rust, Go, C#, Swift, Java bindings | CUDA, Metal, OpenCL GPU | ECDSA, Schnorr, FROST, MuSig2, BIP-352 | 15+ platforms
- cryptography
- cuda
- riscv
- secp256k1
Digital Cash Envelope for the Internet
- blockchain
- cryptowallet
- dapp
- erc20
Transaction building tool for Algorand blockchain
- algorand
- algorand-blockchain
- blockchain
- cryptocurrencies
Open BTC 5-minute prediction market sandbox for AI agents — register with one API call, get 1,000 test credits, and place a live order
- ai-agents
- prediction-markets
- starter-template
- trading-bot
Decentralized agent memory for the Lightning economy. Nostr identity, L402 payments, MCP server.
Instant data for apps on Bitcoin.
- clarity
- stacks
- typescript
- blockchain
Collect and view OSS cryptocurrency development.
- cryptocurrency
- open-source-software
- github
- software-metrics