Tblib is a project mainly written in Python, it's free.
A Trackback client in Python
A Trackback (client) implementation in Python
>>> import tblib
>>> tb = tblib.TrackBack()
>>> tb.autodiscover('http://Queue/weblog/matt/archives/2003_01.html#000007')
>>> print tb.tbUrl
http://Queue/weblog/mt-tb.cgi/7
>>> tb.blog_name = 'My Weblog'
>>> tb.title = 'This Post Will Ping That Weblog Entry'
>>> tb.url = 'http://postneo.com'
>>> tb.excerpt = 'I released tblib 0.1.0 today. It supports autodiscovery...'
>>> tb.ping()
>>> print tb.tbErrorCode
0$ tbclient.py -tburl http://Queue/weblog/mt-tb.cgi/7 -title "My Title" -excerpt "My Excerpt" -url http://postneo.com -blogname "My Weblog Name"
Trackback command line client here. Preparing TrackBack...
TrackBack URL: http://Queue/weblog/mt-tb.cgi/7
TrackBack Title: My Title
TrackBack Excerpt: My Excerpt
Your URL: http://postneo.com
Your Weblog Name: My Weblog Name
Pinging http://Queue/weblog/mt-tb.cgi/7...
HTTP Response: 200 OK
TrackBack Error Code is: 0 (zero is okay)
Done!Copyright 2003, Matt Croydon
Licensed under GPL.