matrix-appservice-slack is a Slack bridge that supports bridging Slack channels to Matrix. Users authorize the bridge to access their Slack workspaces and from there they can pick the channels they'd like to bridge.

Name	Actions
No bridge configurations.
{{ bridge.upstreamId ? "matrix.org's bridge" : "Self-hosted bridge" }} ({{ bridge.provisionUrl }})

Add matrix.org's bridge Add self-hosted bridge