Better-mail is a project mainly written in Java, based on the GPL-3.0 license.
The Gmail web-app for mobile in it's own process. Great for Android 1.6 devices stuck with the old Gmail client.
Better Mail is a simple application that I made because I was fed-up with the bugs and limitations in the stock Android 1.6 Gmail application.
The application's uses the mobile version of Gmail for its GUI (Like G-Wizz's apps for iOS devices). But also implements a Broadcast Receiver on gmail-ls to provide native Android push notifications.
Better Mail makes uses of Google's private APIs. To build Better Mail you need to locate a suitable framework.jar and place it inside the libs directory.