The Curators will sometimes need to be able to edit videos. For example in order to create previews/teasers. Although it's doubtful the best tools are available for free, there may go some that are good enough!
Research video editing software that has (some) the following functionalities, in order of priority:
A) Cut and splice videos
B) Add still images
C) Add/replace audio tracks (for specific frames only)
D) Transcoding (change the video format, without negatively affecting the audio/video quality)
For each of the Operative System below, test the default software, and search for the "top" recommended free alternatives, and report back:
What file formats are supported