Web development on PowerPC I'm interested in LAMP stack and Nodejs stack for PowerPC (iMac g5). Do they exist for Mac OS X 10.5.6 PPC?
I still use Mac OS X 10.5.8 for web development. It has a built-in Apache server with PHP, but I easily installed MAMP.

As for node.js, the V8 engine under the hood requires Intel CPU, but RingoJS and Rhino work fine. There is Rhinode for node.js-like API on top of Rhino, but I haven't tested it.