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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Forgejo
Forgejo project (Codeberg e.V.) · Version control & code hosting
Community-governed self-hosted Git forge forked from Gitea, stewarded by Codeberg e.V., with pull requests, issues, packages and Forgejo Actions
GPL-3.0-or-laterOpen sourceFreeSelf-hostedNov 2, 2026
Gitea
Gitea Ltd. / Gitea community · Version control & code hosting
Lightweight self-hosted Git forge written in Go with repositories, pull requests, issues, packages and GitHub-compatible Actions, deployable as a single binary
MITOpen sourceFreeSelf-hostedNov 2, 2026
GitLab
GitLab Inc. · Version control & code hosting
Open-core DevSecOps platform combining Git hosting, merge requests, integrated CI/CD pipelines, registry and security scanning, available as SaaS or self-managed
MITFreemiumPaidSelf-hostedNov 2, 2026
Slack
Slack Technologies (Salesforce) · Collaboration & communication
Channel-based team messaging platform from Salesforce with threads, huddles, canvases, workflow automation and an extensive bot and app API
ProprietaryFreemiumPaidNov 2, 2026
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
Zotero
Corporation for Digital Scholarship · Citation management
Free, open-source reference manager with browser connectors, word-processor plugins, a PDF reader, group libraries and optional paid file storage
AGPL-3.0-onlyFreeOpen sourceLocalNov 2, 2026
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