VideoTaped is a very small and efficient piece of software relying on ffmpeg to do video files concatenation. Most on-board cameras create file chunks of 4GB or less, making uploads to platform such as Kinomap difficult. Just select the files to merge, precise if you want to trim at the beginning and at the end, press the "TAPE NOW" button and generate your final file very fast: no further encoding is required. VideoTaped can also remove the audio track, and even the subtitle track that sometimes includes GPS data so that you can use an external GPS file for final uploads.
Requires Java 1.7 or higher.