There are 3 repositories under blender-vse topic.
Add-on for video editing in Blender 3D: edit videos faster! Included in Blender 2.81+
Tools for using the Blender Video Sequence Editor, including a titler (old)
Blender add-on for editing NicoDoga-style game play video
Adds a letterboxing effect ("cinebars") to the project. (2.80+, 2.79)
A cross platform script that renders non-3D blender projects faster and gives access to additional FFmpeg features
Korean, English typing effect on Blender VSE