Forums in the Open Source Niche

1. ABestWeb Affiliate Marketing
Read through for news and resources on software development topics, including low-code-no-code, serverless computing and programming languages.
http://www.abestweb.com/forums/  

2. Mindless Self Indulgence
Maintenance Mode
http://www.mindlessselfindulgence.com/board/  

3. Joomla!
Just made it into the top 50!
https://forum.joomla.org/  

4. Chronicle Forums
Chronicle Forums - Index
http://chronicle.com/forums/  

5. Whitby Sea Anglers Forums
Whitby Sea Anglers Forums - Index
http://www.whitbyseaanglers.co.uk/forum/  

6. The Sewing Academy @ Home
The Sewing Academy @ Home - Index
http://www.thesewingacademy.org/  

7. West Coast Connection
West Coast Connection Forum - Index
http://www.dubcc.com/forum/  

8. schoolofevolutionaryastrology.com
School of Evolutionary Astrology Message Board - Index
https://schoolofevolutionaryastrology.com/forum/  

9. DIYstompboxes.com
DIYstompboxes.com - Index
https://www.diystompboxes.com/smfforum/  

10. Java Forums at the Big Moose S
https://www.coderanch.com/forums/  

11. Keeptouch Community Portal
Keeptouch Community Portal is an online community based in Singapore, offering a place for exchange of ideas and information in a wide range of topics in the form of forum discussions and Internet...
http://forums.keeptouch.net/  

12. Mens Tennis Forums
A forum community dedicated to male tennis players and enthusiasts. Talk about everything from the ATP, NSMTA, to college Tennis and even everything about equipment. It's all here!
http://www.menstennisforums.com/  

13. Daz 3D Forums
Daz 3D, 3D Models, 3D Animation, 3D Software
https://www.daz3d.com/forums/  

14. Siccness Network
Forum has 5,537,847 posts.
http://siccness.net/vb/  

15. www.divorcesource.com
https://www.divorcesource.com/ubbthreads/  

16. Start Backpacking Travel
Use the backpacking forums to get answers for your next trip! Find travel jobs posted, writing opportunities, and more. See two excellent travel forums.
https://www.startbackpacking.com/forums/  

17. Forums Forums
Forum has 76,172 topics.
http://www.forumsforums.com/3_9/  

18. RuneScape Community
The RuneScape Wiki is a RuneScape database that anyone can contribute to. Includes skills, quests, guides, items, monsters and more.
http://forums.zybez.net/  

19. Wilders Security Forums
Community Based Discussions about Online Privacy, Security and Data Protection
http://www.wilderssecurity.com/  

20. Getbig Bodybuilding, Figure an
Getbig.com: American Bodybuilding, Fitness and Figure - Index
https://www.getbig.com/boards/  

21. TableTennisDaily
TableTennisDaily sharing Table Tennis content to the World. All the Latest Videos, World Tours, Articles, Discussion's, reviews and more!!
https://www.tabletennisdaily.co.uk/forum/forum.php  

22. sternfannetwork.com -&nbs
sternfannetwork.com is your first and best source for all of the information you’re looking for. From general topics to more of what you would expect to find here, sternfannetwork.com has it all....
http://www.sternfannetwork.com/xen/index.php?forum/  

23. Hip Hop Universe
Hip Hop Universe - Your forum source for Hip Hop Rap Music Scene, mixtape, dj ...
http://www.hiphop-universe.com/underground/  

24. www.islamicity.org
IslamiCity: Providing a comprehensive view of Islam and Muslims to cultivate peace, promote universal values, and dialogue among civilizations since 1995
https://www.islamicity.org/forum/default.asp  

25. AnandTech Forums: Technology, Hardware, Software, and Deals
Forum has 36,126,817 posts.
http://forums.anandtech.com/  

26. UKCampsite.co.uk
UKCampsite.co.uk Camping and Caravanning Forums. The UK's largest and busiest forums for caravans and camping and motorhomes
https://www.ukcampsite.co.uk/chatter/  

27. CanadianGunNutz.com
Canadian firearms and guns news source. Canadian gun owners community. The largest free Canadian new and used firearms market place and classifieds.
https://www.canadiangunnutz.com/forum/forum.php  

28. AppraisersForum.com
Real estate appraisers forum that is open to all. Discuss real estate appraisal on these real estate appraiser forums.
https://appraisersforum.com/forums/  

29. CryptocurrencyTALK
Since 2013, CryptocurrencyTALK forum has been the source for advice on what crypto to mine, cryptocurrency technical details, new altcoin launch announcements, and advice from trusted members of...
https://cryptocurrencytalk.com/  

30. Open Photography Forums
Imaging to hold up a lantern to ourselves and the planet we’ve claimed dominion!
https://openphotographyforums.com/forums/  

31. RunningForums.com
This website is for sale! runningforums.com is your first and best source for all of the information you’re looking for. From general topics to more of what you would expect to find here,...
http://www.runningforums.com/index.php  

32. HardwareCentral Forums
Hardware Central Forums are your source for computer hardware discussions, with tips and tricks on buying, upgrading and maintaining your laptop, notebook and desktop PC or peripherals. Topics...
http://www.hardwarecentral.com/forum.php  

33. vibalt.com
Recent Discussions (1/1) - Kunena - Lithuanian (LT)
https://vibalt.com/lt/forum  

34. Honda-Acura.net
An unofficial Honda and Acura discussion forum
https://www.honda-acura.net/forums/  

35. Overclockers UK Forums
Just missed out on a spot in the top 25.
http://forums.overclockers.co.uk/  

36. VolleyBall
Volleyball Forum is a free Volleyball enthusiast forum. Discuss all aspects of Volleyball from AVP tour, International competition to Collegiate Volleyball. Registration is FREE!
http://www.volleyballforum.com/  

37. GSM-Forum
Forum has 2,153,392 members.
https://forum.gsmhosting.com/vbb/  

38. Forums & Groups
https://www.democraticunderground.com/?com=forums  

39. Rolex Forums
Forum has 121,039 members.
http://www.rolexforums.com/  

40. The Watch Forum
Welcome to the Watch forum where you can discuss modern and vintage watches with other collectors and enthusiasts or just let off steam in the more open forums.
https://thewatchforum.co.uk/  

41. EnviroLink Forum
Forum has 67,673 posts.
http://www.envirolink.org/forum/  

42. MMA News
The official forum site of MMANews.com, Forums.MMANews.com is now BACK online after a down-time of over 8 days.All members of the MMANews.com forums at
http://www.mmanews.com/forums/  

43. Steam Users' Forums
This is a discussion forum powered by vBulletin. To find out about vBulletin, go to http:www.vbulletin.com .
http://forums.steampowered.com/forums/  

44. Harry Potter Friends
Harry Potter Cursed Child and Fantastic Beasts movie news, Rumors, Forums, Images, Role-Playing, Fan-Fiction, Fan-Art, Movie and Books Information and more!
https://www.snitchseeker.com/  

45. Sell & Trade Game Items | OSRS Gold | ELO
Sell & Trade 2007 RuneScape Gold, ELO Boosting, Rocket League of Legends, Runescape Private Server gold, Pokemon Go Accounts, FIFA coins, CS:GO keys, Diablo III Accounts.
http://www.sythe.org/  

46. DR1 Dominican Republic Forums
The Dominican Republic's most up to date source for news and travel information.
http://www.dr1.com/forums/forum.php  

47. Forumosa
Taiwan's largest and most active Taiwan-oriented global online community in English
http://www.forumosa.com/taiwan/  

48. DSL Reports
ISP discussion forums, broadband news, information and community
https://www.dslreports.com/forums/all  

49. Apolyton Civilization Site
Forum has 165,224 topics.
https://apolyton.net/forum.php  

50. Rap Battles
The Biggest Rap Battle Site and Community
http://www.rapbattles.com/forum/