Forums in the Android App Niche

1. PPCGeeks
PPCGeeks is a site for PPC owners with discussion, reviews, news, links, downloads, and much much more. We cover Windows Mobile, Android, Windows Phone 7, Blackberry, iOS, and tablets.
http://forum.ppcgeeks.com/  

2. Parrot Pilots Drone Forum
Parrot Drone forum and discussions around your favorite Parrot drones including Anafi, Bepop, AR, FPV, Disco and more!
https://parrotpilots.com/  

3. Mountain Project
Find rock climbing routes, photos, and guides for every state, along with experiences and advice from fellow climbers.
https://www.mountainproject.com/forum/  

4. Games Dreams
Welcome to Games Dreams - Discussion forums for Facebook games, browsers games, MMO games, flash games, android games, iPhone iPad games, etc.
https://gamesdreams.com/  

5. Geocaching Forums
https://forums.groundspeak.com/GC/  

6. Tech Support Guy
Just missed the top 10.
http://forums.techguy.org/  

7. www.skimble.com
Skimble forums.
https://www.skimble.com/workout-trainer/forums/  

8. 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/  

9. LIVESTRONG.COM
LIVESTRONG’s Webby-Award winning MyPlate App is the fastest and easiest way to lose weight and improve your health! Join millions who have lost weight with MyPlate
http://www.caloriesperhour.com/forums/  

10. WinDrivers Computer Tech Suppo
This is a discussion forum powered by vBulletin. To find out about vBulletin, go to http://www.vbulletin.com/ .
https://forums.windrivers.com/forum.php  

11. Google Community
The #1 Unofficial Google Forum to discuss and chat on the use of Google products and services, such as Gmail, AdWords, AdSense, Analytics and YouTube.
http://www.gforums.net/  

12. Whirlpool.net.au
https://forums.whirlpool.net.au/  

13. Hi-Def Ninja Forums
Forum has 936,506 posts.
http://www.hidefninja.com/forums/  

14. DonationCoder.com
DonationCoder.com Forum - Index
https://www.donationcoder.com/forum/  

15. Supercell Community Forums
Supercell's official Community Forums for all fans of Clash of Clans and Hay Day! Join today!
http://forum.supercell.net/forum.php  

16. Freefly Forum
Forum has 10,688 members.
https://forum.freeflysystems.com/  

17. Neowin
News, Reviews & Betas which includes large community peer support
https://www.neowin.net/forum/  

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

19. forums.crackberry.com
The #1 Community Forum for BlackBerry Users & Abusers! BlackBerry Help, Discussion, Rumors and More...
https://forums.crackberry.com/  

20. MobileRead Forums
MobileRead - the resource for mobile geeks seeking information and advice for keeping their gadgets happy.
http://www.mobileread.com/forums/  

21. wololo.net/talk
Forum has 302,229 posts.
https://wololo.net/talk/  

22. DJI Spark Drone Forum
DJI Spark Drone Discussions, Support, Forum and Online Community
https://sparkpilots.com/  

23. AfterDawn Discussion Forums
Massive tech discussion forums, focusing on digital video, consoles, PCs and software problems.
http://forums.afterdawn.com/  

24. www.go4expert.com
Forum has 97,250 posts.
https://www.go4expert.com/forums/  

25. www.dreamincode.net
https://www.dreamincode.net/forums/  

26. Student Doctor Network
A nonprofit community of pre-health and health professional students.
https://forums.studentdoctor.net/  

27. www.daniweb.com
Programming Forum - Our Programming forum category encompasses application development, web development, programming theory, and everything in between.
https://www.daniweb.com/programming/4  

28. Sports Card
SportsCardForum is your source for everything related to sports cards for collectors and non-collectors alike!
https://www.sportscardforum.com/forum.php  

29. The Money Shed
The UK's largest community based forum dedicated to earning money from home online. Make money now, save money and share ideas!
https://www.themoneyshed.co.uk/index.php  

30. Autel Drone Forum
Autel Evo and X-Star Drone Forum, Discussion, Photos, Videos and More!
https://autelpilots.com/  

31. Storm8 Community Forums
Forum has 59,043 topics.
https://forums.storm8.com/forum.php  

32. Wilders Security Forums
Forum has 218,490 topics.
http://www.wilderssecurity.com/  

33. The Skeptics Society Forum
Forum has 780,026 posts.
https://www.skepticforum.com/  

34. iPhone, iPad, iPod Forums at i
Discuss and get help with iPhone, iPad, iPod touch, iOS, and iCloud
https://forums.imore.com/  

35. BeerSmith Home Brewing Forum
BeerSmith discussion forum
https://www.beersmith.com/forum/index.php  

36. Parrot
Parrot Forums covers the entire range of Parrot ownership and care. All parrot families are discussed as well as pet birds in general.
http://www.parrotforums.com/  

37. WWW.RLFANS.COM
https://forums.rlfans.com/  

38. Overclockers Forums
Overclockers Forum is the number one source for hardware related discussion.
https://www.overclockers.com/forums/  

39. WebRats Fun and stupidity at i
Forum has 2,676,550 posts.
https://forums.webrats.com/  

40. Canadian TV, Computing and Home Theatre Forums
A forum community dedicated to Canadian TV, computing and home theatre owners and enthusiasts. Come join the discussion about home audio/video, displays, troubleshooting, styles, projects, DIY’s,...
http://www.digitalhome.ca/forum/  

41. UAV Coach Community Forum
https://community.uavcoach.com/  

42. iSTORYA.NET
Cebu's Most Active and the Philippines' Strongest Online Community!
https://www.istorya.net/forums/  

43. Virtual Dr Forums-Computer Tec
This is a discussion forum for general computer PC help and troubleshooting
https://discussions.virtualdr.com/forum.php  

44. VBForums
Visual Basic Discussions plus .NET, C#, game programming, and more (http://www.VBForums.com)
https://www.vbforums.com/forum.php  

45. Fantasy Football - Footballguys Forums
Many people go football crazy over sports forums like this one.
https://forums.footballguys.com/forum/  

46. BariatricPal
Visit the world’s largest weight loss surgery forums to discuss diets, procedures, and related bariatric topics. Join now for free and lose more weight with peer support!
http://www.lapbandtalk.com/  

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

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

49. CNET
CNET editors and users share the top tech 'how to' tips and tricks with advice for getting the most out of all your gadgets.
https://forums.cnet.com/  

50. CivFanatics Forums
Largest fan site for Sid Meier's Civilization series.
http://forums.civfanatics.com/