Which tool is good for Defect tracking/Logging in testing for testers?

Any one can give the information about which tools are free for Defect Tracking/Logging and For Reporting the Bugs on the net. I have searched there is no free tools are available for defect tracking on the net. I have find out some tools Bontq, FogBugz, Mantis, Dev Track and Bugzilla. b开发者_运维技巧ut these all are paid up tools only. I have registered for free trail version, In that I felt Bontq is good for adding Bugs, adding cases and then email notifications and for reporting the information to developers. Can any body please suggest me, Thank you in advance.

There are many topics on that matter. I suggest you look through them.

[Mantis][1] is free and easily customisable

[1]: http://www.mantisbt.org/ Mantis

Check out Assembla

Open source projects are free on Assembla. But that might not be your case.

Mantis is free by the way.

FogBugz is free in the following case:

The FogBugz Student and Startup Edition allows teams of one or two people to use a complete, full-featured version of FogBugz, professionally hosted at our data center, at absolutely no cost