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Does anyone have much experience with/opinions on the various systems out there?

Specifically I'm interested in games that are designed for solo play or have solo play possibilities baked into them (Four Against Darkness, Dungeonous, Scarlet Heroes, ...) rather than solo engines to use with RPGs in general (Mythic GME etc.) or gamebook systems (Lone Wolf etc.).

There's a good number of them out there and currently my time constraints don't allow me to simply try out all of them.

Hardcore Narrativist @hardcorenarrativist

@cardboard @Alamantus The only one I have tried is English Eerie. I liked it a lot but I cannot compare to others :-/ I also know of Quill, which is supposed to be very good, but I haven't tried myself. Both are available in DriveThruRPG.

@hardcorenarrativist @Alamantus Thanks for sharing! I've had a quick look at both of those and it looks like they're closer to creative writing/storytelling exercises than to crunchy dice-rolly fare but I'd still count them as solo RPGs. :)

@cardboard @hardcorenarrativist I just realized that I have a simple one that I haven't played yet: One Deck Dungeon. I backed it on Kickstarter, but I think you can just buy it normally now. It's not super crunchy, but it's got a bunch of d6's to roll and random chance and cool art:

@cardboard @Alamantus Oh, indeed! From my handle you can guess that I'm not that fond of crunchy systems :-P

And I forgot the fantastic The Skeletons, by @jmstar, which can be played solo. You don't write anything down but there aren't any dice either. Also available from DriveThruRPG.

Possibly not that interesting for you due to the lack of crunch, but I think it's a great concept, maybe you can try a similar reversal with whatever game(s) you end up with.