Last Updated on February 27, 2026
Castor is a graphical client for plain-text protocols written in Rust with GTK.
It currently supports the Gemini, Gopher and Finger protocols.
This is free and open source software.
Key Features
Cross-platform support – runs under Linux, macOS, and Windows.
Website: git.sr.ht/~julienxx/castor
Support: Code Repository
Developer: Julien Blanchard
License: MIT License
Castor is written in Rust. Learn Rust with our recommended free books and free tutorials
Related Software
| Graphical Gemini Clients | |
|---|---|
| Lagrange | Beautiful typography with full Unicode support |
| Kristall | Browser without support for css/js/wasm or graphical websites |
| Geopard | Colorful, adaptive Gemini browser |
| Agregore | Minimal web browser for the distributed web |
| Castor | Supports the Gemini, Gopher and Finger protocols |
| Eva | GTK+ client written in Rust |
Read our verdict in the software roundup.
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