Haven’t tested it for a long time, but I entered the download URL for Rainbow into a profile in MineOS and “Rainbow.jar” as the file name. Everything worked out of the box. Server updating, starting and stopping.
Full support for MC 1.8
The project: http://www.project-rainbow.org/
The download URL I used: http://www.project-rainbow.org/site/index.php?action=downloads;sa=downfile&id=230
At least it looks promising…