Mattermost External Download Technical networking apparatus designed for programmers by SpinPunch as an alternative to the Slack community External Download Technical networking apparatus designed for programmers by SpinPunch as an alternative to the Slack community Vote: (3 votes) Program license: Free Developer: SpinPunch, Inc. Works under: Mac Also available for Windows Vote: Program license (3 votes) Free Developer SpinPunch, Inc. Works under: Also available for Mac Mac OS X Windows