Kdenlive is an acronym for KDE Non-Linear Video Editor. It is a free software (GPL licensed) primarily aimed at the Linux platform, but it also works on BSD  as it relies only on portable components (Qt and MLT framework). Windows versions are also available, with some drawbacks. See Windows issues for more information. A port on MacOS is currently in progress.
Non-linear video editing is much more powerful than beginners’ (linear) editors, hence it requires a bit more organization before starting. However, it is not reserved to specialists and can be used for small personal projects.
Through the MLT framework, Kdenlive integrates many plugin effects for video and sound processing or creation. Furthermore Kdenlive brings a powerful titling tool, a subtitling feature with automatic speech to text conversion, and can then be used as a complete studio for video creation.
Video editing features¶
Multitrack edition with a timeline and virtually unlimited number of video and audio tracks, plus facilities for splitting audio and video from a clip in multiple tracks
Non-blocking rendering. You can keep working on a project at the same time a project is being transformed into a video file
Effects and transitions can be used with ease, and you can even create some wipe transitions of your own!
Simple tools for easy creation of color clips, text clips and image clips
Automatic Clips creation from pictures directories, with crossfade transitions among the images
Configurable keyboard shortcuts and interface layouts
and much more!