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
Forum has 86,717 topics.
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
#1 Source for Gangsta Rap!
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
Forums Forums - Off Topic Forum FUN
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. 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  

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

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

22. 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  

23. 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/  

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

25. AnandTech Forums: Technology, Hardware, Software, and Deals
Forum has 2,356,777 topics.
http://forums.anandtech.com/  

26. 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  

27. chorus.fm
Chorus.fm is a curated music destination for those looking for something outside of the mainstream. News, reviews, forums, articles, and commentary. Founded by Jason Tate.
http://www.absolutepunk.net/forum.php  

28. 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/  

29. CanadianGunNutz.com
Forum has 528,912 topics.
https://www.canadiangunnutz.com/forum/forum.php  

30. 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/  

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

32. 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/  

33. 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  

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

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

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. Overclockers UK Forums
Overclockers UK Forum powered by Xenforo
http://forums.overclockers.co.uk/  

38. Rolex Forums
Rolex forum - Rolex discussion forum, Rolex news, Rolex features, Rolex gallery, Rolex resources, Rolex reviews, Rolex watches,Rolex sales,Tudor,Panerai,Omega
http://www.rolexforums.com/  

39. GSM-Forum
Welcome to gsm-forum, here you find all infos about android, windows mobiles, iphones, flashing, repair, unlocking, root, development software, firmwares.
https://forum.gsmhosting.com/vbb/  

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

43. 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/  

44. 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/  

45. Catholic Answers Forums
Explore the Largest Catholic Database: Beliefs, Practices, Articles, Books, Videos.
http://forums.catholic.com/index.php  

46. Sell & Trade Game Items | OSRS Gold | ELO
Forum has 364,377 members.
http://www.sythe.org/  

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

48. 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  

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

50. Apolyton Civilization Site
Just missed out on a spot in the top 25.
https://apolyton.net/forum.php