| Client Name | Programming Language | License |
|---|---|---|
| Artemis | Java | Apache 2.0 |
| Firefly* | Go | BSD-3-Clause |
| Harmony | Java | GPLv3 |
| Lighthouse | Rust | GPLv2 |
| Lodestar | JavaScript (TypeScript) | GPLv3 |
| Nimbus | Nim | Apache 2.0 / MIT |
| Prysm | Go | GPLv3 |
| Shasper | Rust/Substrate | GPLv3 |
| Trinity | Python | MIT |
| Yeeth | Swift | GPLv3 |
- Firefly is essentially Geth for ETH2, and is an empty repo for now.