adventure - Original concept & cog by locastan. My version is a collaboration between TrustyJAID, Draper, and myself and is now markedly different than locastan's version. The repo can be found on my repo page here on github.
away - Originally by Paddo, written for v3 by Axas, final tests by aikaterna, and large improvements by TrustyJAID. Set and unset a user as being "away", or other statuses.
cah - Cards Against Humanity, played in DM's. This can rate limit large bots via the sheer number of messages sent. Install and use with caution on larger bots.
discordexperiments - Create voice channel invites for various built-in apps. This is only for developers or for people that can read the code and assess the risk of using it.
invites - Display invites that are available on the server and the information those invites contain. The bot must have the administrator permission granted on the guild to be able to use this cog.
partycrash - A port of Will's partycrash command from the v2 Admin cog. This cog will not generate invites, but will show already-existing invites that the bot has access to view.
tools - A collection of mod and admin tools, ported from my v2 version. Sitryk is responsible for a lot of the code in tools... thanks for the help with this cog.
voicelogs - A record of people's time spent in voice channels by ZeLarpMaster for v2, and ported here for v3 use. This cog is licensed under the GPL-3.0 License.
Support for these cogs is via opened issues on the appropriate repo or in the Red - Cog Support server at https://discord.gg/GET4DVk, in the support_aikaterna-cogs channel.