Paper Mario: Master Quest is a mod made for "Paper Mario" on the N64. It was created by Emperor_Thamz, Rainchus, JaThePlayer, and Brotenko. It revamps old content and adds plenty of new as well.
Often considered "The Dark Souls of Paper Mario", the mod is incredibly difficult.
Super Mario: The Lost Dreams is a ROM hack of Super Mario 64 developed by Xeraclom14. It features 50 stars to collect in new levels with a more eerie and glooming aesthetic and landscapes than the original game.
Sunshine Secret Book 64 is a ROM hack released on December 2, 2019 by Dan-GPTV. The hack has 40 Shine Sprites to collect, and they are spread across 5 main levels and 3 secret levels. This hack has multiple custom objects in it.
A Super Mario 64 ROM hack which replaces Mario with Fox and Falco from Super Smash Bros. Melee, along with parts of their moveset, most notably the shield (known as "shine").
Super Mario 64 Land is ROM hack/mod for Super Mario 64 inspired by Super Mario 3D Land's gameplay and aesthetics, featuring moves and power-ups (like Cat Mario and Tanuki Mario) not found in the original game and new mechanics (such as a ranking system).
Banjo Kazooie: Smash Bros. TEMPLE is a ROM hack/mod for Banjo-Kazooie (Nintendo 64) by Kurko Mods. It is a recreation of the Temple stage (based on the Zelda series) from Super Smash Bros. Melee (and later games). Banjo and Kazooie need to find the collectibles in order to unlock new entrances in the Temple.
Banjo-Kazooie Worlds Collide is a fanmade, unofficial Banjo Kazooie romhack. Explore 9 worlds and a hub world, each comprised of memories from Banjo-Kazooie games past, complete with a custom soundtrack made of combinations of BK tunes!
Book of Mario is a text-hack of the Paper Mario (Nintendo 64) created by Fatguy703 and his fans. The text within the game is produced by oscillating translations several times (with Google Translate) to change the dialogue, creating a very different plot from the original game. The game also has a new badge added, which was only obtained via hacking.