Introduction

• Project Salamander was a project to build a PIM application for handheld computers. It's written in Python and looks like a possible starting point: http://cvs.handhelds.org/cgi-bin/viewcvs.cgi/salamander/ , http://www.xfree86.org/~keithp/xconf2001/salamander.pdf . The project looks dead now (replaced with another project called GPE, written in C) but the code might be better than starting from scratch.
• ToDo Manager looks like another good baseline. It's written in Python, and unlike Salamander it seems to be under active development. http://todo-manager.sourceforge.net/
• Python code to read iCal files: http://www.slac.com/~mpilone/projects/pythonplayground.phtml

• more code (poosibly more full-featured than the others) to read/write icard and icalendar, a wrapper of evolution's code: http://pants.heddley.com/2002/03/05/2002-03-05.html
• code to read vcalendar data into DOM trees, and write it back out again: http://www.logilab.org/vcalsax/
• interesting site, perl code but lots of interesting info: http://reefknot.sourceforge.net/

• "XML From Your Palm" by Norman Walsh - http://wwws.sun.com/software/xml/developers/palm/
• PIMnet: XML tools for sharing Palm data - http://pimnet.sourceforge.net/
• Winzig is a small PIM written in python, similar in intent to Salamander, but (as of 2003-01) under active development http://www.muth.org/Robert/Winzig/

• JiCal is java software to translate iCal files into free/busy files that can be shared via webservers. http://jical.sourceforge.net/
• haystack is an MIT project which looks as if it accomplishes a lot of what I wanted to do here - http://haystack.lcs.mit.edu/