Oddmuse 6 was going to be the successor of Oddmuse written in Perl 6. Perl 6 turned into Raku and I couldn't really get a grasp on Raku so eventually I abandoned it. I did learn to package my source code for CPAN, though.
Blog posts:
2018-10-08 Setting up Oddmuse 6
2018-10-06 Next Steps for Oddmuse 6
2018-09-20 Perl 6 Peer Review?