It's a very long story behind these games but I'll try to keep it short. First, there's an engine called Zelda Classic that allows people to make these games with relatively little effort. Previously, you couldn't export them into standalone executable form and so they weren't available on Indie game sites such as this one. But that recently changed and I've uploaded a few of them that I love onto indie game sites.
Second, only one of these games is mine - Insanity Unchained. The others that you see here are made by other people but I like them a lot, so I uploaded them. But they weren't written by me.