ThreadFox
Reddit rules index · Product shortlists
Where can I promote
open-source projects on Reddit?
Explain what your project does and who can use it. Where FOSS is required, the project must be free and open source.
4 community routes have a permissive saved verdict and supporting rule text below. “Thread only” means using the designated thread, not starting a promotional post.
Rules read 2026-10-04 to 2026-10-10. Shortlist checked 2026-10-13. Member counts are from each saved read, not live counts. Rules can change; check the linked community rules before posting.
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Tell us about your product on the free-plan page to get a more specific starting point.
Subreddits that allow self-promotion for open-source projects
r/foss
Post with conditionsThe promoted software must be free and open source.
Rule: Promotion must be FOSS
When promoting something, it must be Free and Open Source Software.
How to use this route: Promote only Free and Open Source Software. A proprietary tool or a closed-source free tier does not meet the stated condition.
r/AppsWebappsFullstack
Post with conditionsFor an open-source app or other software project.
Community sidebar
You can post and describe your mobile app, web app, full-stack, or software here, including its features and the problems it solves.
How to use this route: Describe the app, its features and the problem it solves. Keep the post safe for work, civil and free of discriminatory or violent content.
Read r/AppsWebappsFullstack rules · Visit the community · Full saved rules
r/devtools
Post with conditionsFor open-source tools useful to developers.
Rule: No Spam
This sub is not meant to advertise services. Submissions about projects you've worked on are welcome, but only if you include some information about how you built it or why it matters.
How to use this route: Explain how you built the project or why it matters to developers. The community allows project submissions but is not a place to advertise services.
Read r/devtools rules · Visit the community · Full saved rules
r/OPENSOURCEDTOOLS
Post with conditionsThe sidebar explicitly invites projects you built or contributed to.
Community sidebar
Developer Spotlight: Show off open-source projects you’ve built or contributed to.
Rule: No spam
Excessive promotion, spam, or advertising of any kind is not allowed.
How to use this route: Keep the showcase relevant to open-source software. The no-spam rule still prohibits excessive promotion and advertising.
Your product, your starting point
Turn the shortlist into a free Reddit plan.
Share what you are making and who it helps. Start with the free plan to narrow down communities and the kind of post that fits.
These are dated readings of community rules, not moderator approval for a particular post. Quotations belong to the communities; the route notes are ThreadFox’s reading.