The most exciting projects

Rating list is based on the Github and Android Arsenal activities.
1. Font Awesome
Details
Mar 6, 2017
2. Material Design icons
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Jan 6, 2017
3. RxJava
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Mar 8, 2017
4. Retrofit
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Mar 8, 2017
5. OkHttp
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Mar 8, 2017
Commercial
6. Universal Image Loader for Android
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Feb 3, 2017
7. JSON Server
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Mar 9, 2017
8. Guava
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Mar 7, 2017
9. ZXing
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Mar 8, 2017
10. MPAndroidChart
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Mar 8, 2017
Promotion
11. Butter Knife
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Mar 3, 2017
12. libGDX
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Mar 7, 2017
13. cocos2d-x
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Mar 7, 2017
14. greenrobot/EventBus
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Feb 22, 2017
15. Picasso
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Mar 12, 2017
16. Glide
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Feb 26, 2017
17. LeakCanary
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Mar 6, 2017
18. Syncthing
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Mar 7, 2017
19. SlidingMenu
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Oct 16, 2016
20. Fresco
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Mar 7, 2017
21. Android Asynchronous Http Client
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Feb 24, 2017
22. RxAndroid
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Jan 10, 2017
23. chrisbanes/Android-PullToRefresh
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Sep 22, 2016
24. ViewPagerIndicator
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Jan 5, 2017
25. PhotoView
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Jan 13, 2017
Blurb
26. AndroidAnnotations
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Mar 8, 2017
27. Amaze UI
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Mar 4, 2017
28. fastjson
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Mar 6, 2017
29. lottie-android
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Mar 13, 2017
30. google-styleguide
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Mar 3, 2017