Video Editor for Linux. Flowblade is a multitrack non-linear video editor for Linux released under GPL 3 license.

With Flowblade Movie Editor you can compose movies from video clips, audio clips and graphics files. Clips can be cut at the desired frames, filters can be added to clips, and you can create multilayer composite images using compositor objects.

Slick, declarative command line video editing & API.
Editly is a tool and framework for declarative NLE (non-linear video editing) using Node.js and ffmpeg. Editly allows you to easily and programmatically create a video from a set of clips, images, audio and titles, with smooth transitions and music overlaid.