When I opened it with ImageMagick it appears to be a transparent PNG. Very clever trick, as it seems to use Twitters black background when viewing an image to achieve the effect.
Wine is always a viable option, especially for older games. With DirectX 11 support coming later this year, almost every Windoze only game should hopefully work.
The way the GitHub page is set up is weird. Basically two different plugins are hosted on one repo. The root tree you linked to has the original client required plugin. Go under "Skypeweb" folder and you'll see it's an entirely different plugin that you can compile and don't need a client (also has its own README).
"third-party Skype client (e.g. to have support in Pidgin)"
Funny because recently the old Skype plugin for Pidgin was re-written to utilize the new HTTP Skype. So now you have a nice client-less Skype chat in Pidgin. I'm certain someone could study it to write their own client.
Quaddicted is a great site ran by a great Quake archivist/enthusiast (Spirit). He's helped keep back ups of Quake mods and maps and even written a java application to download and install them easily onto your Quake installation from his site. Just don't appreciate the domain name, appreciate the guy too!
Nice to see this, hopefully we'll get some more involved features like notification support and group chat. Still sad that Facebook never utilized XMPP chat to its fullest.
I've heard about how SF has been some financial trouble, but isn't all this adware nonsense just going to hurt them more in the end? Surely some crowdfunding option could've been more of a viable effort...
I remember a while back Xash3D was a very illegal project gathering code from many other projects (sometimes without any form of credit). I'm unsure if the situation has dramatically changed, but I still wouldn't trust the project.