ENIGMA Development Environment vs Melharfi

Almost full support for GML,
The ability to create and access C++ types, templates, and functions, compile DLLs and other C/C++ scripts

Support for Windows, Mac and Linux.

Enigma can support over 90% of gamemaker's GML language

besides the powerful combination between GML and C++, beginners can also use drag and dropping.

Written in C++, many features have been demonstrated running much faster than interpreted equivalents in GameMaker (up to 10-20 times faster than GM 8.1).

Changes are made daily to add new functions/fixing bugs.

A full stack trace with available cores and memory information as well as operating system and Java version including file names and number is generated whenever an exception is encountered, with a handy link to submit the issue to GitHub.

All objects/graphics have a mouse events like MouseClic MouseDoubleClic MouseDown MouseUp MouseOver MouseMove MouseOut

Lidgren Network Library

Uses the A* algorithm or pathfinding

It use a GDI to draw on windows forms. You can use all windows self GUI (controls) for your game like TextBox, Button Label ..., you don't need to install a third party or use an ugly controls.