5E: 2019-Present.
2E(Advanced): Planning on to sometime in the upcoming years.
BECMI/Rules Cyclopedia/Lamentations of the Flame Princess kit-bash: Planning onto sometime in the upcoming years.
Pathfinder 2nd Edition: Well, I splurged on the prior(not the current one) Humble Bundle Pathfinder deal and pretty much have the PDF of the main book, Lost Omens World Guide, and The Character Guide. Now I want to get the Special Edition of Gears and Guns, the Ancestry Guide(specifically for Kitsunes*cough-Fox Girls*), the Advanced Players Guide, Secrets of Magic, and the Gamemastery Guide. Finally I want to nab the complete Abomination Vault AP book that is coming out next year. (Special Editon of course.) Hopefully the idea/sales scores big enough with Paizo that they start to release the other previous APs, like Extinction Curse, as a complete book as well. So amazingly, planning onto sometime in the upcoming years.
13th Age: I'm actually still kicking myself for not pulling the trigger on it when Humble Bundle was offering it. Planning on trying it out when Humble Bundle offers it again. Will combine elements from 13thG into it with Shards of a Broken Sky being the main "campaign focus" for playing it.
Complicated Answer/Choice: 3.0/3.5/Pathfinder 1 Black Tokyo's knock off version of Strike Witches (with some of the more questionable elements removed) Unknown at this time/looking up crap.