Slack N Study allows your team to create private study groups for various topics and other team members can query for the topics and add themselves in the private channel to become part of the study group. If you work together, why not study together? :D
Commands possible:
/sns set [topic]
Set topic for the study group
/sns find [topic]
Find a study group with the topic
/sns show-all 
Shows all the study groups in team
/sns add-to [channel]
You are added to the study group directly!