What is this?

Digimon re:SET is the collective name and hub for the Digimon FDD (Fan Digimon & Digidestined) projects produced by Ken E. (Glitchgoat, PlagueMD). Unless otherwise specified, each project within the re:SET multiverse is set in its own continuity, with no prerequisite knowledge (of either canon or fan-project) required for comprehension.

Digimon re:GENESIS was originally published between October 2011 and October 2013; it is mirrored and archived here, and is 51 chapters long. It is rated PG.
Digimon re:CONNECT began in March 2017 and is currently running. It will run for approximately 50 chapters. It is rated R.
Digimon re:LOAD (rated PG), Digimon re:ACTOR (rated PG), and Digimon re:FUSE (rated R) are projects that have been announced (or at least vaguely hinted at) but do not currently have set release dates because HAVE YOU SEEN HOW MUCH EFFORT EACH OF THESE DUMB THINGS IS, KEN IS ONLY ONE MAN.

For the uninitiated, FDD is a very old fandom nickname for digimon fancharacters and Digimon-related fan-projects that center around original characters, original stories, and original universes within the Digimon header. Much as how Digimon as a franchise is made up of numerous continuities and universes with their own rules, so too are FDD projects. Often the projects are set up with the general structure of the television anime. They're glorified fanfiction and they're wonderful.