uMap is the best web-GIS alternative to Google Maps

Really.  You should try it.  http://umap.openstreetmap.fr/en

Pros:

• Can split lines (Google Maps can’t).
• Can move features to different layers (Google Maps can’t).
• Can have advanced attributes, line styles.
• Can see distances plotted with features.
• Can turn layers on and off.
• Can import data ()GPX, KML).
• Can limit who can see and who can edit.
• Uses OpenStreetMap, so if you know your GPS is right and the basemap is wrong, you can change the basemap.

Cons:

• No satellite imagery basemap.
• Can’t switch layer display order (but can duplicate layers, might be possible to change order that way).

I haven’t played with everything, but I’ve built a map for a race I’m directing and I’m sharing this with the participants.