Top 30 Haskell packages with most reverse dependencies

Reverse Dependencies shows the reverse dependencies of each Haskell package (those packages that depend upon it). I sorted the list to check the packages with most reverse dependencies. Here are top 30 Haskell packages among 2348 packages.

1. base 5961
2. containers 2110
3. bytestring 2018
4. mtl 1664
5. directory 1068
6. text 979
7. transformers 971
8. filepath 934
9. time 723
10. array 696
11. process 628
12. QuickCheck 621
13. network 581
14. parsec 577
15. random 537
16. HUnit 491
17. template-haskell 488
18. vector 429
19. binary 399
20. test-framework 379
21. utf8-string 334
22. unix 331
23. old-locale 325
24. deepseq 323
25. pretty 288
26. stm 274
27. test-framework-quickcheck2 270
28. test-framework-hunit 264
29. attoparsec 263
30. aeson 254

Though the list does not show the importance of each package, there is high chance that you need to use at least one of these packages when you write your own package. So to become a seasoned Haskell programmer, you need to get accustomed to these packages.