some work for a group called petslime

I use Tiled for both unity work as well as work within my own engine. It has a lot of helpful export options and a plugin subsystem that makes the program very robust.

Yeah they only released the CS2 series and all other software released at the same timeframe as CS2. Which it was end of life anyways and adobe wasnt going to make money on it. I bought a CS6 key a long tima ago for cheap when the cloud transition was happening which was lucky since those keys had skyrocketed in price soon after. CS6 is still a viable option in my opinion and well rounded minus some caching issues mainly with photoshop.

I know Autodesk does give away student versions and doesnt ask for much besides you to create an account though anything you make in their 3D applications have meta data saying its from a "not for profit" version of the software that pops up every time you open the project file unless you save it as a .fbx or .obj
In fact one of my friends from college animation is going into a pixar internship still cranking out and even selling things from his student version of maya. The licenses are just too expensive now for how common use these software kits are becomming.
GMS isnt as bad as the rest but they shouldnt have invalidated your key. Unity in my opinion is a real monster of an organization and they do a lot of trash business behind the scenes to try and steal from small developers. I strongly encourage using things like godot instead.

I used Autodesk Maya for 3D animation and Modeling as well as Mudbox for sculpting and theyre amazing just their price is unjustifiable today and its pointless if 5 years down the line theyre going to revoke your license simply because its shifting your release to End Of Life status.

Ive had Unity take my pro license away back when they switched to a subscription service. Just recently autodesk took my licenses for Maya, Mudbox, and 3DS Max 2015 suite. Its just something these companies do and honestly its why a lot of people turn to piracy and cracked versions of their software rather than dealing with cloud sub services. I still run Adobe CS6 simply because I know the creative cloud service is a ripoff.