Radicle is an open source, peer-to-peer code collaboration stack built on Git. Unlike centralized code hosting platforms, there is no single entity controlling the network. Repositories are replicated across peers in a decentralized manner, and users are in full control of their data and workflow.

The Radicle protocol leverages cryptographic identities for code and social artifacts, utilizes Git for efficient data transfer between peers, and employs a custom gossip protocol for exchanging repository metadata. All social artifacts are stored in Git, and signed using public-key cryptography. Radicle verifies the authenticity and authorship of all data for you. Radicle is local-first, providing always-available functionality even without internet access. Users own their data, making migration, backup, and access easy both online and offline. The Radicle Stack comes with a CLI, web interface and TUI, that are backed by the Radicle Node and HTTP Daemon. It’s modular, so any part can be swapped out and other clients can be developed.

Repo: https://app.radicle.xyz/nodes/seed.radicle.xyz/rad:z3gqcJUoA1n9HaHKufZs5FCSGazv5

In the AUR.

OpenPCR is a fully functional yet affordable ($599us) PCR (polymerase chain reaction) device, used for replicating DNA for the purposes of sequencing or barcoding (species determination). The whole kit - from the software to the hardware itself - is open source, so you can download the code, CAD, and Eagle files and build your own if you don't want to buy a kit.

RepRap is an open-source (hardware, software, and documentation) desktop fabrication system which lets you construct arbitrary objects (or parts for assembling more complex systems). It's unique in that you can construct one yourself for about $400us, and it is fully capable of making duplicates of itself.