The SQLBooster trial version is most functional and has almost all the features you'll find in the registered version, it is limited by a trial period of 30 days.

SQLBooster 32 Bit for Windows

Version 1.0: SQLBoosterInst32.zip

SQLBooster 64 Bit for Windows

Version 1.0: SQLBoosterInst64.zip

Note: 3 simple steps to get a free full license!

1. Download the latest version of SQLBooster, get a free trial license;
2. Use SQLBooster to tune your SQL;
3. Write a blog about your tuning, and sent the blog URL to sqlfast@gmail.com