CLEO Android is an Android version of the top-most popular Grand Theft Auto PC add-on - CLEO library, which enchances GTA III, GTA VC and GTA SA script engine with ability to load custom scripts and use new script commands.
Before you start with CLEO you should know that it requires root (su) in order to be installed, also read readme before doing anything with your Android device. For the support, more detailed explanations and user scripts go to the gtaforums topic.
CLEO supports GTA3 v1.4, GTAVC v1.3, GTASA v1.0.0/2/3/5/6/7
Take a look on CLEO Gold, it features CLEO for GTA III, GTA VC and GTA SA in one app and already has lots of scripts for GTA San Andreas inside, this is the way you can support CLEO developer :)
Topic on gtaforums