The most exciting projects

Rating list is based on the Github and Android Arsenal activities.
Commercial
1. Font Awesome
Details
Nov 17, 2018
2. OpenCV
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Nov 12, 2018
3. RxJava
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Nov 17, 2018
4. Material Design icons
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Oct 21, 2018
5. JSON Server
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Nov 3, 2018
6. OkHttp
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Nov 7, 2018
7. Guava
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Nov 11, 2018
8. Retrofit
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Nov 5, 2018
9. MPAndroidChart
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Nov 16, 2018
10. ZXing
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Nov 15, 2018
11. Kotlin
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Nov 17, 2018
12. Glide
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Nov 13, 2018
13. AndroidUtilCode
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Nov 14, 2018
14. Tesseract
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Nov 12, 2018
15. Butter Knife
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Nov 15, 2018
Blurb
16. Lottie
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Nov 16, 2018
17. lottie-android
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Nov 13, 2018
18. Syncthing
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Nov 14, 2018
19. LeakCanary
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Oct 25, 2018
20. google-styleguide
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Nov 7, 2018
Announcement
21. greenrobot/EventBus
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Aug 27, 2018
22. Godot
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Nov 16, 2018
23. Universal Image Loader for Android
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Apr 11, 2018
24. libGDX
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Nov 11, 2018
25. cocos2d-x
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Nov 12, 2018
26. fastjson
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Nov 12, 2018
27. Picasso
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Nov 11, 2018
28. RxAndroid
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Oct 29, 2018
29. Fresco
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Nov 9, 2018
30. BaseRecyclerViewAdapterHelper
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Oct 15, 2018