Uuh Fusion
Overall better than Game Maker. 100 times simpler to use while still being really powerful, has lots of really good free extensions, a dlc that allows for super-easy 3d development, lots of tutorials, has the permanent licence actually cheaper than Game Maker (and is often being discounted on Steam), but it's also actually a evolution of the holy klik & play software.
It was used for every FNAF 1-6, I Wanna Be The Guy, Freedom Planet, The Pilgrim's Progress game, The Escapists, Tobias, etc...
Even Tobias