Open source focus

Open Source Alternatives to 4chan

5 open source Internet options similar to 4chan, ranked by named competitors first, sector overlap, and our 0-100 AI-readiness score. Every company listed publishes its source: each one carries an open source sector tag and a public GitHub repository.

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Lemmy23
Social Media
A decentralized, open-source social link aggregator and discussion platform for communities.
Open source · Self-hostable
Mozilla Firefox54
InternetSan Francisco, United States$2.3M
Open-source web browser focused on privacy, user control, and an open internet.
Open source · Self-hostable
Mastodon51
Social MediaJena, Germany$63.0M
A decentralized, open-source social media platform and alternative to larger apps like X and Threads.
Open source · Self-hostable
OWASP38
CybersecurityRaleigh, USA
A global non-profit foundation dedicated to improving software security through open community collaboration.
Open source · Self-hostable
FxTwitter31
Open Source
Open-source tool to fix and enhance Twitter/X embeds on Discord, Telegram, and other platforms.
Open source · Self-hostable

Company	Sector	License	HQ	Funding	Score
LemmyA decentralized, open-source social link aggregator and discussion platform for communities.	Social Media	Open source · Self-hostable	—	—	23
Mozilla FirefoxOpen-source web browser focused on privacy, user control, and an open internet.	Internet	Open source · Self-hostable	San Francisco, United States	$2.3M	54
MastodonA decentralized, open-source social media platform and alternative to larger apps like X and Threads.	Social Media	Open source · Self-hostable	Jena, Germany	$63.0M	51
OWASPA global non-profit foundation dedicated to improving software security through open community collaboration.	Cybersecurity	Open source · Self-hostable	Raleigh, USA	—	38
FxTwitterOpen-source tool to fix and enhance Twitter/X embeds on Discord, Telegram, and other platforms.	Open Source	Open source · Self-hostable	—	—	31