Seamlessly build cross-platform mobile Bitcoin wallets.

Bitcoin Dev Kit

A free, open-source community resource for designers, developers, and others working on non-custodial bitcoin products.

Bitcoin Design Community

Bitcoiner.guide

A think tank studying the future of money.

Bitcoin Policy Institute

Start accepting Bitcoin payments with 0% processing fees & no third-party intermediary.

BTCPay Server

Cashu brings near-perfect privacy for users of custodial Bitcoin applications by using a Chaumian ecash system.

Cashu

We help you find and support open-source Bitcoin projects - helping create a better tomorrow, today.

General Fund

GrapheneOS is a private and secure mobile operating system with great functionality and usability. It has near full Android app compatibility via our sandboxed Google Play compatibility layer.

GrapheneOS

Funding nostr protocol development and other stuff.

The Nostr Fund

Contributions to the OpenSats Operations Budget will be used to cover our operating expenses as we continue to facilitate frictionless, tax-deductible donations from the community to the Bitcoin & FOSS ecosystems at a pass-through rate of 100%.

Operations Budget

RGB is a system of private & scalable client-validated smart contracts on the Bitcoin & Lightning networks. RGB is a digital rights management system.

We help people have a feature rich bitcoin experience, maintain privacy, and thrive as a sovereign individual.

RoninDojo

Sapio is a tool for defining such smart contracts in an easy way and exporting easy to integrate APIs for managing open contracts.

Sapio

The goal of SeedSigner is to lower the cost and complexity of Bitcoin multi-signature wallet use. To accomplish this goal, SeedSigner offers anyone the opportunity to build a verifiably air-gapped, stateless Bitcoin signing device using inexpensive, publicly available hardware components (usually < $50).

SeedSigner

Sparrow is a desktop-only Bitcoin wallet for those who value financial self-sovereignty. Sparrow’s emphasis is on security, privacy, and usability. Sparrow does not hide information from you - on the contrary, it attempts to provide as much detail as possible about your transactions and UTXOs, but in a way that is manageable and usable.

Sparrow Wallet

Splicing is the ability to resize Lightning channels on-the-fly, giving users of the Lightning Network many additional benefits that were not intuitively obvious at first.

Splicing

Stratum V2

Summer of Bitcoin is a global summer internship program focused on introducing university students to bitcoin open-source development and design. Till date, Summer of Bitcoin has funded 124 students from 15 countries to contribute to over 29 open-source bitcoin projects.

Summer of Bitcoin

Monitor and manage your node from any browser and any device.

ThunderHub

The Tor Project advances human rights and defends your privacy online through free software and open networks.

The Tor Project

Zeus is an open-source, non-custodial Bitcoin wallet that gives you full control over how you make payments.

OpenSats Funds

Listed Projects