Can anybody let me know features of features cyanogen, who develop this.
Is it by hackers?
Check out the official website: http://www.cyanogenmod.com/about for a full list of features. And the community members at http://wiki.cyanogenmod.com/index.php?title=Community_Members The lead developer has just recently been employed by Samsung.
"CyanogenMod is a customized, aftermarket firmware distribution for several Android devices. Based on the Android Open Source Project, CyanogenMod is designed to increase performance and reliability over Android-based ROMs released by vendors and carriers. CyanogenMod also offers a variety features & enhancements that are not currently found in these versions of Android"