Suggest me some open source or free Database Schema designer tool. plz suggest good one.
Your brain and a pad of paper works great.
Query Browser and associated tools are nearing EOL and as per advisory from MySQL, users should now use MySQL workbench
mysql tools, i would guess, will only work properly for a mysql database
since the original poster did ~not~ post this question in the mysql forum, what are the odds that a mysql tool is the best choice?
Why dont you give a try to mysql query browser.