gtk-gnutella is a server/client for the Gnutella peer-to-peer network.
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A PDF optimizer
OcenAudio
Easy, fast and powerful audio editor
MultiWriter
Write an ISO file to multiple USB devices at once
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The spiritual successor to FeedReader
OpuaraaM
The most advanced open-source music visualizer
Hoho'a video Tss
Video Trimmer cuts out a fragment of a video given the start and end timestamps. The video is never re-encoded, so the process is very fast and does not reduce the video quality.
Tixati
Tixati is a New and Powerful P2P System
UnGoogled Chromium
ungoogled-chromium is Google Chromium, sans integration with Google
Piper
Piper is a GTK+ application to configure gaming mice.