The opsi community forum:

https://forum.opsi.org/index.php

• News: Announcements from the opsi development team about updates, fixes,
  Every opsi-user should follow this sub forum
• Open sub forums for 'Bugs' , 'Comments, suggestions, wish list' and 'free support' in English and German

The opsi community wiki:

https://wiki.opsi.org/

• opsi-script collection
• free opsi repositories
• scripts, tips, links,

The opsi developer blog:

https://blog.opsi.org/

• Technical news and stories from the workbench