The public materials list MIT / enterprise add-ons; score is reduced where edition or component boundaries need review.
Mattermost
Open collaboration platform for team messaging, workflows, incident collaboration, and developer operations.
69Mixed
Where it fits
Teams that want self-hosted chat and collaboration with integrations into operational workflows.
Watch points
Edition boundaries and mobile/push dependencies should be reviewed for sovereignty needs.
Score breakdown
Mattermost has public source and self-managed deployment paths; score reflects the expected operating footprint for collaboration.
A self-hosted deployment keeps primary data under operator control, with migration and backup quality depending on the deployment design.
Privacy posture depends on configuration, telemetry, retention, and integration choices documented or implied by the public project materials.
The project exposes standard web, API, protocol, or integration surfaces appropriate to collaboration.
The score reflects maintenance burden, release maturity, and the operational complexity implied by running this class of software.
It can be deployed in an EU-controlled environment; procurement fit still depends on support, contracts, accessibility, and hosting choices.
Ownership and development are publicly visible through the linked project materials, but governance depth should be reviewed before procurement.
Review notes
Seed listing for the Sovereign Web Stack catalog. Treat this score as an evidence-backed starting point: contributors should improve it with more specific public links, deployment notes, security posture, export documentation, and governance evidence as the index matures.
Methodology note
This project is scored against the public Sovereign Web Stack methodology. Review the full scoring model before comparing tools across categories.