Kynetx offers developers a single platform for building extensions for multiple browsers. Developers write their code in Kynetx's own rule-based language and the service builds the actual extensions. Originally, Kynetx only supported Firefox and Internet Explorer, but a few days ago, the company also announced support for Google Chrome. Thanks to this, developers can now use Kynetx's AppBuilder tool to build and deploy custom extensions for the three top browsers that offer a built-in plugin architecture.
For now, of course, only the Windows version of Chrome supports extensions, but extension support for the OSX and Linux version is scheduled to arrive soon.
Kynetx is a universal browser extension that has a few similarities to Greasemonkey. The programming language for the extension is the Kynetx Rule Language (KRL) and the company offers an online editor for writing apps on top of Kynetx.