Slackin - Create your own public Slack chat community
Slofile - A public Slack database with live channel & member stats
Mio - Powering seamless communication between workplace chat apps.
2000 (!) Slack Groups - The largest curated list of verified Slack groups
Chats.Directory - A curated list of the best Slack groups for professionals
Microsoft OneDrive - Secure access, sharing & file storage