Mattermost 6.3.1
Access your Mattermost instance with your credentials using the desktop app
Mattermost software
DlSoftware247 lists 2 Windows programs by Mattermost, mostly Office Suites, System Utilities software. The most popular are Mattermost, Focalboard.
Focalboard 7.11.3
Focalboard is an open source, self-hosted alternative to Trello, Notion, and Asana.