The best replacement for odata is rest.

The best alternatives to odata are rated as following:
★★★★★  rest
★★★★  web api
★★★  gdata
★★★  rdf
★★  wcf data services
★★  servicestack
★★  o data
★  wcf

Your alternative for odata is not listed? Suggest!
Speaking about odata, one probably shouldn't forget about web api.

Other search terms related to odata and their ratings are:
★★★★★ web api
You have in mind a companion for odata and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of odata in all years. Click on graph for more.
odata
rest
web api