Tuxguitar is an open source guitar tablature editor for linux, macOS, windows, and freeBSD. It’s a powerful alternative application to commercial guitar tablature softwares like Guitar Pro or Tab Pro.
OpenShot Video Editor is a free, open-source video editor for Linux. Easily add sub-titles, transitions, and effects, and then export your film to DVD, YouTube, Vimeo, Xbox 360, and many other common formats.
Mplayer2 is a fork of mplayer and SMPlayer2 is a fork of smplayer with additional enhanced features that users are looking for.
GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.
FFmpeg is a powerful tool for multimedia enhancements, conversions, encodings, recording, streaming, and other multimedia related stuffs. It supports many video codecs such as x264, vorbis, theora, xvid, and so on for video encoding.