Please be aware that links in this thread are not valid anymore. Some even point to scammer groups.

Here are some official Links (as of May 2022):
Website: https://ambrosus.io
Forum: gov.ambrosus.io
Telegram english: https://t.me/Ambrosus
Telegram turkish: https://t.me/ambrosus_tr
Telegram price chat: https://t.me/lambrosus
Ambrosus explorer: https://explorer.ambrosus.io
Ambrosus blockchain stats: https://stats.ambrosus.io/

There's also a Slack server, but you would have to ask on telegram to get an invite.