Footage
Footage is a tool with basic video editing functions. A free and open source program
slomoVideo
slomoVideo – creating slow-motion videos from your footage. Free and open source program
MKVToolNix
MKVToolNix is a free and open source, multi-platform, universal and powerful set of tools for working with MKV format files
Avidemux
Avidemux is a free and open source, multi-platform video editor designed for simple tasks: cutting, filtering and encoding
LosslessCut
LosslessCut – free and open source, simple and ultra fast cross platform tool for lossless trimming/cutting of video and audio files