[StevePerkins]

Nearly the entire Lone Wolf saga (20+ books) was donated and made freely available on https://www.projectaon.org, along two other minor series by the same author (one "Mad Max"-style postapocalyptic, and the other military-themed).

Lone Wolf was one of the best series in this genre back in the 1980's, and doesn't get nearly enough mention in comparison to the CYOA or Steve Jackson stuff.

They are long out of print, but I still have a soft spot in my heart for the GrailQuest series... a very loosely King Authur-themed series with a much more whimsical and campy style. I remember mailing the author a fan letter when I was about 10 years old, and receiving a very nice handwritten reply from Ireland (which I probably still have tucked in an old photo album somewhere). In the age of email, social media, and $50 autograph lines at cosplay conventions, younger people will probably never know the magic of contacting a favorite author and unexpectedly receiving a tangible reply later on.

[strictnein]

Lone Wolf was great. Incorporated RPG elements, inventory that carried over between books, and a decent battle system that didn't require dice.