Flare is an unofficial app that lets you chat with your friends on Signal from Linux. It is still in development and doesn’t include as many features as the official Signal applications.
It is available for install on Flathub. You can find installation instructions for other platforms and methods here.
If you have an issue with Flare, would like to suggest an improvement, or would like to contribute one yourself, the source code is available here.
We also have a Matrix room where you can discuss Flare with us!