I think it would be easier to convert the game if you have access to the source code. Currently I’m thinking about something like an old text adventure from the early 80s, Pyramid by Rodger Olsen. It’s not a very good game but have some sentimental value to because it was one of the earliest adventures I played and I’m familiar with the original BASIC-code (I modified the TRS80 BASIC to C64 BASIC a couple of years back).
Edit: Anchorhead is a great suggestion by the way!
Edit 2: Curses! would also be great, with the source code missing and all. But it is a bit big for a first attempt and the conversion should really be done in Inform6/7 for this timeless classic.
The go-to these days would probably be WordPress.com. Only real downside is you can’t upload arbitrary files, so any example code would probably have to live on GitHub or something like that
GitHub Pages is also an option if you’re content with static content only (e.g., no comments).
(Edit: and when converting a game, it’s probably best to pick something relatively recent whose author is still around to give consent, or use something that’s under an open-source license to begin with.)
You’d obviously need to ask Ryan Veeder for permission, but Craverly Heights might be a good option. It has already been ported to Dialog and it would be nice to have a three way comparison between ZIL, Inform 7 and Dialog.
Gareth Rees’s Through the Looking Glass has always been my go-to for testing out the different IF engines that I cobble together. It’s fairly short but it’s also pretty complex and it hits all of the important areas.
I’ll second Blogger - especially because you can just sign into it with your gmail credentials if you have them. I also use a free WIX website and it has hooks to embed a blog from Blogger which seems to work seamlessly. (Don’t laugh, I haven’t blogged in forever…)
It could certainly go here, although about 75% of our content is already tutorials so we may not need a special category. It could go under Authoring and the system or “Other Development Systems” with a tag.