> It would be interesting if the author post in github a feature request for the 3 missing packages that are more painful. (3 is a good numbers to find someone else that care about one of them, more than 3 or 4 would be annoying)

here's a few that come to mind.

1. mumble client

2. CLI framework similar to cobra, click, etc

3. Bot framework similar to Cinch

4. WebRTC

5. off the shelf plugin framework

6. ssh library

7. gopher library (or just libcurl)

8. ntlk (natural language toolkit)

9. file/libmagic clone

10. image manipulation library

11. expect-like library for automation

12. probably more, these came to mind

> I use continuations only as an emergency exit inside nested fors, no fancy stuff. (I agree the fancy stuff is weird.)

Part of the racket web server requires continuations to use - so that's a blocker for anyone wanting to check out the racket web server in its entirety.

If one needs to do anything nontrivial with state, one might end up wanting dynamic-unwind, which means understanding continuations. (Example https://github.com/winny-/umask/blob/master/umask-lib/umask/... )

> I think units/signatures is almost deprecated. It will be there forever to keep backward compatibility, but I expect new code to use modules instead of units.

Can you do plugin architecture without signatures/units?