Dan has contributed to a whole mess of board games, card games, roleplaying games, and digital apps as both a writer and a designer-developer. (Yes, there's a difference between the two roles. No, it doesn't make a lot of sense to anyone outside the industry.)
For board games and card games, you can find Dan's ludography at his Board Game Geek profile, until he puts it up here.
For RPGs, check out Dan's RPG Geek profile.
For digital apps, well, there's only the three so far:
BattleLore: Command (2014)
Descent: Road to Legend (2016)
Elder Sign: Omens (2011)
Dan won a Golden Geek award for the Star Wars: Edge of the Empire Beginner Game!
Dan’s put together a pretty rudimentary Game Writing Portfolio, which you can find in PDF format right here: Game Writing Portfolio (PDF)