There are two main types of no deposit bonuses - free spins and free cash.
http://horsecity.ru/phpBB3/viewtopic.php?f=7&t=263321
http://forums.indexrise.com/thread-726264.html
http://horsecity.ru/phpBB3/viewtopic.php?f=33&t=171469
http://horsecity.ru/phpBB3/viewtopic.php?f=32&t=391109
http://kiteonly12.free.fr/viewtopic.php?f=11&t=164930
http://forum.fretky.cz/jak-ji-naucit-na-za...co-t194028.html
https://www.rcfl.com.hk/forum.php?mod=viewt...9242&extra=
http://forum.spolokmedikovke.sk/viewtopic....8&t=1082514
https://ufr-2020.front5.picapo.net/forums/v....php?pid=450791
https://debate.socialism.nl/forum/showthread.php?tid=158023