After The Deadline is contextual spell checking, grammar checking, and style checking technology. It has seamless service integration with online publishing tools and platforms (WordPress, TinyMCE, etc.). AtD's sophisticated language models can catch and suggest corrections to subtle errors in context.
Agar is a toolkit for graphical applications. It features a modern GUI system with an unobtrusive API. Agar can use different graphics interfaces, such as SDL and OpenGL, and it has been ported to numerous platforms, including game consoles and embedded systems. Agar is implemented in C, but can be used from other languages.
AgileJ StructureViews is an Eclipse plugin that generates highly configurable reverse engineered class diagrams for Java programmers. It specializes in supporting agile project development through the automated production of high presentation quality class diagrams with project-specific content generated and regenerated with minimal user effort.
aircrack-ng is a set of tools for auditing wireless networks. It's an enhanced/reborn version of aircrack. It consists of airodump (an 802.11 packet capture program), aireplay (an 802.11 packet injection program), aircrack (static WEP and WPA-PSK cracking), airdecap (decrypts WEP/WPA capture files), and some tools to handle capture files (merge, convert, etc.).