Polished Map 4.0.0 now supports viewing events—NPCs, warps, signs, etc—in pokecrystal- and pokered-based projects. (Likewise with 2.0.0++ if you're using attributes.bin and .ablk files.)
https://github.com/Rangi42/polished-map/releases/tag/v4.0.0https://github.com/Rangi42/polished-map/releases/tag/v2.0.0%2B%2BMore info and screenshots:
https://hax.iimarckus.org/topic/7222/Note that it does not (yet) let you edit events, but if you change the .asm in a text editor, Ctrl+R will quickly reload it.