Hi Pablo
See µTasker Kinetis support for a list of IDEs.
You can use CodeWarrior 10.x for up to 128k code (enough for most work)
Another completely free one is CooCox but you will have to check on the laster Kinetis debugger support in it.
You can also work with VisualStudio Express and GCC - without debugger it is free. There is a GDB debugger for it but it costs a little, and requires you to have the full VS version too.
It is still possible to work with KDS - it may have a few debugger restrictions since it is aimed at newer devices - but it can still work.
If you have a small budge available (that is rather than $0 being the top-end) check out Rowley Crossworks since it is well prices and powerful.
Regards
Mark
Kinetis: µTasker Kinetis support
K60: µTasker Kinetis TWR-K60N512 support / µTasker Kinetis TWR-K60D100M support / µTasker Kinetis TWR-K60F120M support
CAN: http://www.utasker.com/docs/uTasker/uTaskerCAN.PDF / FlexCAN.wmv - YouTube
For the complete "out-of-the-box" Kinetis experience and faster time to market