Calidar is out and I reviewed the PDF a couple of days back. It really is awesome, but I am struck by how well it can be used pretty much anywhere.
Plus look at these awesome maps.
So for this edition of "Plays Well With Others" I want to focus on what you need to do to make Calidar work for your current favorite system.
Calidar and D&D 5
This is kind of a cheat really. One of the implicit design goals of D&D 5 was "D&D your way". So given that Calidar works well with Pathfinder, working with D&D is not a stretch. Plus the "default" world of D&D 5 might be the Forgotten Realms, but enough Greyhawk, Dragonlance and even Mystara names are thrown around it should be obvious that you can play this on any world. D&D 5 does a much better job of capturing that high fantasy feel than previous edition's "Points of Light" or "Dungeon-punk" attitudes. So does Calidar. Plus both D&D 5 and Calidar are new and can "grow up together" in the inventive mind of a DM.
The best thing about this marriage is you don't even the "full" version of D&D 5! You can use the free D&D 5 Basic edition. The races are the basic four (human, elf, dwarf, halfling) and the basic four classes (cleric, fighter, wizard, thief). This stripped down version of D&D5 works perfect with Calidar. The races all have their own respective planets and the classes cover all the bases.
Calidar and Original D&D
Or you could go the other direction and use the original D&D rules. The same reasons apply from D&D 5, but I have something specific here in mind. I would play Calidar more as a Planetary Romance. One thing I always to do was play OD&D as a Barsoomian game. I loved the Edgar Rice Burroughs books and I always felt that OD&D and Barsoom would be a perfect fit. Calidar would be the glue that holds it all together.
Plus Calidar has a Mars-like planet now, but sadly not a Barsoomian one. Barsoom would be a nice fit and give the Calidar game something a little bit different.
Here are some links I have been using to get my Mars/Barsoomian fixes.