Pipes is being very buggy lately and has stopped saving new pipes these days. Google Mashup Editor and Microsoft Popfly are both discontinued. Are there are any currently running web apps(or atleast libraries that run on appengine) that do something similar ?
(This question has been asked several times...n For example: Yahoo Pipes clone script? Alternatives to Yahoo Pipes )
Pipe2py is a compiler script that will generate a Python equivalent of a Yahoo Pipe given the URL of the pipe:
https://github.com/ggaughan/pipe2py/
(Note that not all Pipes blocks have yet been implemented.)
A "hosted" version of Pipe2Py is also available on Google App Engine: http://pipes-engine.appspot.com/
You might also find YQL [ http://developer.yahoo.com/yql/console/ ] and Scraperwiki [ http://scraperwiki.com/ ] useful