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Tool Evaluation

Text Chat

Requirements

• private chat
• group chat
• channels (and sub-channels?)
• send files via chat
• some kind of project context would be nice
• mobile app (?)
• guest access (?)

Possible open source tools

• Matrix
• Rocket Chat
• Nextcloud Talk

Evaluation: Matrix (with Element and Synapse) (+ Jitsi)

• Matrix is a decentralized and e2e-encrypted communication platform
• Synapse is the reference Matrix homeserver
• Element (formerly Riot and Vector) provides Web, iOS and Android Apps (-> user-friendly on mobile) for Matrix
• easy to set up and well documented
• implements given jitsi server into chat window for voice and video chat
• TURN server necessary for jitsi to connect between clients behind NAT (seems to be difficult to set up)
• project context possible via "Spaces" with channels per "Space"
• modern and fast UI with common features
• Slack, Microsoft Teams and Gitter bridges (see https://element.io/blog/microsoft-teams-and-slack-integration-using-matrix/)
• requiring getting used to: "cross-signed device verification" -> additional PIN that is used for perfect-forward secrecy and needs to be entered after login to read chats from the past

Voice / Video Chat

Requirements

• calls and video calls from chat window (ideally private-, group- and channel-wise)
• stable connection, good voice quality
• if possible e2e-encrypted
• usable for meetings with people from extern (-> not just accessible from chat server)

Possible open source tools

• Jitsi
• Rocket Chat
• Nextcloud Talk

File Storage with editing ("Office" and more)

Requirements

• stores directories and files of every file format
• differentiation between (private files,) shared files and public files (see Access Control)
• sharing documents with people from extern (restrict to read access?) (see Access Control)
• edit files from file storage in browser
• edit documents, spreadsheets and presentations (Microsoft Office and open formats)
• show pdf files (possible editing via annotations?)
• edit markdown files with preview (?)
• collaborative editing for all editable formats (if possible)

Possible open source tools

• Nextcloud
• OnlyOffice
• Collabora

Access Control / User Management

Requirements

• one user account for all services (requiring an account)
• => wide-spread software support
• access control for file storage
  • differentiation between (private files,) shared files and public files
  • sharing documents with people from extern (restrict to read access?)

Possible open source tools

• Protocols: LDAP, OAuth2 / OpenID Connect
• Keycloak

Tasks ("Kanban") (?)

Polls / Time coordination ("Doodle") (?)