CyanogenMod 7 firmware is based on Android 2.3 Gingerbread with additional custom code contributed by the CyanogenMod Team.
The custom portions of CyanogenMod are primarily written by Cyanogen (Stefanie Kondik) but include contributions from the xda-developers community (such as an improved launcher tray, dialer, and browser) and code from established open-source projects (such as BusyBox in the shell).

CyanogenMod 7 development began when Google released Android 2.3's source code.
On 15 February 2011, the first release candidates of CyanogenMod 7 were rolled out on several of the supported devices.
The fourth release candidate was released on 30 March 2011 and brought increased support for the Nook Color and similar devices, as well as many bug fixes.
On 11 April 2011, the public version of CyanogenMod 7.0 was released, based on Android 2.3.3.
CyanogenMod 7.1 was released on 10 October 2011, based on Android 2.3.4.
The latest stable version, CyanogenMod 7.2 was released on 16 June 2012, based on Android 2.3.7, bringing a predictive phone dialer, lock-screen updates, ICS animation backports and many bug fixes.
CyanogenMod 7 firmware is based on Android 2.3 Gingerbread with additional custom code contributed by the CyanogenMod Team. The custom portions of CyanogenMod are primarily written by Cyanogen (Stefanie Kondik) but include contributions from the xda-developers community (such as an improved launcher tray, dialer, and browser) and code from established open-source projects (such as BusyBox in the shell).
CyanogenMod 7 development began when Google released Android 2.3's source code. On 15 February 2011, the first release candidates of CyanogenMod 7 were rolled out on several of the supported devices. The fourth release candidate was released on 30 March 2011 and brought increased support for the Nook Color and similar devices, as well as many bug fixes. On 11 April 2011, the public version of CyanogenMod 7.0 was released, based on Android 2.3.3. CyanogenMod 7.1 was released on 10 October 2011, based on Android 2.3.4. The latest stable version, CyanogenMod 7.2 was released on 16 June 2012, based on Android 2.3.7, bringing a predictive phone dialer, lock-screen updates, ICS animation backports and many bug fixes.
CyanogenMod