Sun/Java

With their J2ME operating system (Java 2 Micro Edition, sometimes
also known as Java 2 Mobile Edition) optimized for wireless PDAs, there is a
heritage of offering platform transparency—write once, run anywhere (WORA).
This is achieved by using byte-level compiling. Effectively the software is
abstracted to a higher level to make it easier to write and make Java applets easier
to move from platform to platform. This feature, however, came at a cost—
additional memory and processor footprint.