There are 2 repositories under f1tv topic.
Race Control is a standalone, open source F1TV client for Windows, written in C# on the .NET platform.
Kodi repo with addons for CanalDigitaal IPTV, F1 TV, KPN/Telfort/XS4All iTV, NLZiet, Telenet, T-Mobile TV, Videoland and Ziggo Go
Android TV app for F1 TV
Browser Extension that enables modern playback controls + Google Cast support for F1 TV
Race TV Multiplayer is an open source F1TV desktop client for Windows with support for multi-monitor setups
Documentation related to the issue: lack of subtitles / closed captioning on Formula 1 TV content library.
[DEPRECATED] Add arrow key seeking to F1 TV video player.