We do not require you to install or activate extra modules for WP ERP. The default modules of Apache and PHP would work fine. If you are using Nginx or any other PHP file serving solution, you can cross check with your phpinfo();

Here is a list of the loaded modules in our development environment-

1. date
2. ereg
3. libxml
4. openssl
5. pcre
6. sqlite3
7. zlib
8. bcmath
9. bz2
10. calendar
11. ctype
12. curl
13. dba
14. dom
15. hash
16. fileinfo
17. filter
18. ftp
19. gd
20. gettext
21. SPL
22. iconv
23. session
24. json
25. ldap
26. mbstring
27. mcrypt
28. standard
29. mysqlnd
30. mysqli
31. mysql
32. PDO
33. pdo_mysql
34. pdo_pgsql
35. pdo_sqlite
36. Phar
37. posix
38. Reflection
39. imap
40. shmop
41. SimpleXML
42. soap
43. sockets
44. exif
45. sybase_ct
46. sysvsem
47. sysvshm
48. tokenizer
49. wddx
50. xml
51. xmlreader
52. xmlrpc
53. xmlwriter
54. xsl
55. zip
56. apache2handler
57. mhash