I’m a developer of Amanda, which has been around and open source for over 15 years, but has always had a fairly small development community. We’re moving to github to try to encourage more active development by creating a more inclusive developer environment. We’re also rewriting the application in Perl, for similar reasons.
15 years! What were you doing in 1994?
Amanda, as the README explains, is a backup system designed to archive many computers on a network to a single large-capacity tape drive. If you’re a Perl monger interested in working on a mature, growing project, check it out.