Apachebooster, An advanced cPanel plugin, tailored to improve the gross server performance of Apache Software. Blended with Nginx and Varnish, Apachebooster helps in improving the website loading speed and the processing speed of the server by speed optimization techniques.
The best thing that I liked is its integration into my Plesk interface which makes managing it easy for me as well has giving us many options such like caching proxy servers or other features provided via this software package are quite amazing! What i did not really enjoy was when we had issues regarding our license key but their support team helped out very quickly solving those minor problems even without any downtime at all!! So far everything's been good apart from some little bugs…
Pros
Integration with plesk
Great variety in plans offered by them, especially if you need to host multiple domains under one account.
Easy licensing process (you can just use your existing licences)