Hi! Gabriel Engel from Rocket.Chat here. Sorry for the intromission, but I was told about this thread and thought that it would be useful if I could clarify some comments made here and make myself available for questions
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Please let me know what problem are you having with the fileupload? We will release the S3 adapter soon that should make things easier.
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We also plan to offer a hosted version, about 12$/user/year and some option when you just pay per server with unlimited users, so it will depend on the usage profile of the organization. We think this should appeal to large communities with a lot of users but not proportionally as much traffic . Visit https://rocket.chat/deploy if you want to have your own team, for free while on beta.
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We build a slack compatible integrations API, so most of the apps that integrate with Slack, will work with Rocket.Chat, you just need to point to the right REST URL.
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We have some features that we believe will be good reasons to move from Slack:
- Audio and Video Conference (WebRTC)
- Built-in Live-chat for Websites (you can see on our own site)
- Federation (beta)
- Screen-Sharing
- Self-Registration
- Theming and Branding via admin panel
Again, sorry for the intromission, have a nice day!