Video Works Catalogue is a tool and a toy, which uses a growing archive of all the video I have ever recorded.
To use, select a tag from the lists to the left. This will play a sequence of every video filed under that tag. You can play between one and four sequences simultaneously. The windows containing the videos and tags can be dragged round the screen.
You can make a sequence 'fullscreen' by clicking on it and then pressing the 'F' key. Press the 'Esc' key to return to the original view.
You can access the source code on GitHub.