A great source for all sorts of packages such as Node.js, Zshell, BitTorrent Sync, Redis, and Firefox Sync Server just to name a few. Check out the full list of packages or just add the source to your package manager :)

1. Log into your NAS as administrator and go to Main Menu → Package Center → Settings → Package Sources.
2. Click Add, type SynoCommunity as Name and https://packages.synocommunity.com/ as Location and then press OK to validate.
3. Go back to the Package Center and enjoy SynoCommunity’s packages in the Community tab

See the official site for more info. Happy hacking!