It could be fan made, but the camera mechanic seems to be from the source code, no? There could be MORE to the mechanic that isn't implemented but this piece at

It could be fan made, but the camera mechanic seems to be from the source code, no? There could be MORE to the mechanic that isn't implemented but this piece at least looks lame edit: and for completeness, nowadays I feel compelled to point out that the latest half life game came out just a month ago