The main use for WebApps is that you can disable cookies, password saving, and flash storage on your default browser. This way, you cannot easily be tracked or have your session hijacked when on public Wifi. You can safely opt to use the mobile versions of some popular apps (like Facebook, Twitter, Google News, etc.) instead of using their Android app counterparts, since the Android apps can leak a lot of private data (e.g. automatic photo uploads, location, your contact list, etc.).
- Works like Mozilla Prism on the desktop. This is a mostly chrome-less browser that gets out of your way.
- Completely full-screen browsing (auto-hiding actionbar)
- Securely browse mobile sites (uses HTTPS)
- Blocks 3rd party requests (images/scripts/iframes) like the NoScript and NotScripts plugins on the desktop
- Blocks requests to non-HTTPS URLs to maintain security (avoid wire-tapping)
- Allows self-signed SSL certificates to be temporarily accepted
- User agent setting allows more rich mobile experience (depending on site)
- External links open in your default browser
- Long-press links to choose how to open them
- Create shortcuts to your webapps on the homescreen
- Uses much less bandwidth than native apps (like Google+ app). No background sync'ing.
- Features local data storage and caching for reduced bandwidth usage and better speed.
- Fully open source software.
For using Google's suite of apps, try the GApps Sandboxed Browser app, which works the same as this app but contains specific handling for Google's web apps.
WebApps is open source. Visit the app's website for more information and source code. Contributions are welcome.