This was taken from the announcement which was posted here.
Firstly, I would like to thank the other developers, beta testers, and the many others involved in this release. The main group of developers, excluding myself, are listed below:
These people have dedicated as much as a year of their time towards the development of GunGame5.1, and up to several years throughout previous versions of GunGame.
Last, but certainly not least, I would like to thank Mattie and the EventScripts Community without whom none of this would have ever been possible. Without your support and efforts, GunGame could never exist.
I would also like to extend a personal thanks to cagemonkey, for the original creation and concept of GunGame. Both cagemonkey and XE_ManUp worked hard on GunGame4, but he was unable to directly participate in the coding of GunGame5, as life has kept him fairly busy recently.
(XE_ManUp can be thanked for the above two paragraphs from the original GunGame5.0 release announcement. :D )
Now to the technical side, which I know any GunGame server administrator will appreciate. In GunGame5.1 we have completely re-coded GunGame in python, yet again, but this time in a much better structure. We have utilized python packages, many included EventScripts features and libraries, and the newly required Source Python Extensions plugin. All of this has contributed to an amazingly fast version of GunGame, which is much easier to configure, maintain, and understand. One of the most appreciated new features which our beta testers have enjoyed is the implementation of cfglib. Now, on most occasions, administrators will only need to extract and overwrite their ../addons/ directory, and not worry about merging any configuration files.
Please understand that, although our beta testers have done a phenomenal job reporting issues which they found and working towards their resolution, there still may be issues to uncover. There also may be suggestions and feature requests you will want to make. We hope that you will be able to help contribute towards the development progress by reporting or requesting on our website.
Also found on our website are numerous custom addons to modify your server even further.
Finally, with the influx of new testers we will have, it is likely that new issue solutions and features will be included. Please check for updates frequently and try to keep your server up to date. This includes updates to Source Python Extensions.
On behalf of the GunGame developer team, we would like to thank you for your past and future support!