EtherPK (our markdown and wikilink based PKMS) now has maps. Lots of the concepts in a PKMS relate to places in the physical world, and for me that's often trips and travel. For example, I keep a list of places I've loved camping, and I often drop a note in my journal about a particular campsite with the [[Campsite]] wikilink. The backlinks for [[Campsite]] already show me every document where I've mentioned one. Now each of those notes can hold a map too, with pins and routes that I place by hand or find by postcode, ZIP code or place name. The Map View then gathers the places by concept. The Map View for [[Campsite]] shows every campsite I've noted on one map, framed to fit them all. (There's no picture of that one, because those places are too special to share here!)