If Nintendo isn’t going to make more Metroid games then it’s up to fans to keep the series going with games like Metroid: Rogue Dawn, an unofficial prequel to the original NES Metroid that’s been over two years in the making and which is now finished.
Pokémon Prism is a fan-made ROM hack for Pokémon Crystal. Over the course of eight years, creator Koolboyman and his team crafted a new Pokémon experience, which they hoped to release this Christmas. Nintendo hit them with a cease and desist four days before release. Thanks to a group of pirates, the project still made it to the internet.
The creator of Pokémon Prism, a fan made hack for Pokémon Crystal that was due to release on Christmas, says he’s received a cease-and-desist from Nintendo and will have to shut down the project for good.
Fun fact: the concept art for Pokémon Red and Blue games showcased a female character that never actually made it into the final game. Actually, gender options for the main character didn’t appear until Pokémon Crystal, in 2001.