Quest Software's database development and administration tool, Toad, is now
available for Sybase ASE, IQ and SQL Anywhere.

You can download the product trial at http://www.quest.com/toad-for-sybase/.
There is also a completely unrestricted full featured version for the Sybase
community available for download at http://bit.ly/oMvRex (.toadworld.com)
but only supports ASE.