I believe you can do all of those things with Inkscape, but it will take some time to figure it out, as it works quite a bit differently than CC. I'm not sure about finding the midpoint; Illustrator can do it, but I don't know if that feature has made it into Inkscape yet.

The biggest things I'd miss from Campaign Cartographer if I had to leave it behind are the fractalization tool, the templates, and the analysis tools. The rest of it can be relatively easily replicated in other drawing programs. Once you get used to them, anyway.