Discord
Discord Inc. · Collaboration & communication
Community chat platform with servers, text and voice channels, video, forums and a bot API, free to use with optional Nitro subscriptions
ProprietaryFreemiumPaidNov 2, 2026
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Moodle
Moodle Pty Ltd (Moodle HQ) · Collaboration & communication
Open-source learning management system used by universities and schools for courses, assignments, quizzes, grading and forums, self-hosted or via MoodleCloud
GPL-3.0-or-laterOpen sourceFreeSelf-hostedBroken
Zoom
Zoom Communications, Inc. · Collaboration & communication
Video meetings and webinar platform, now packaged as Zoom Workplace with team chat, phone, whiteboard, AI Companion and developer APIs and SDKs
ProprietaryFreemiumPaidNov 2, 2026
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