The best replacement for web client is web server.

The best alternatives to web client are rated as following:
★★★★★  web server
★★  desktop client
★★  citrix receiver
  thick client
  fat client
  smart client

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

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



Google Trends

Scale is based on the average worldwide traffic of web client in all years. Click on graph for more.
web client
web server
desktop client