Burp Suite Free Edition v1.4 is now available for download.
This is a major upgrade with numerous new features, including:
The ability to compare site maps
Functions to help with testing access controls using your browser
Support for preset request macros
Session handling rules to help you work with difficult situations
Auto recognition and rendering of character sets
Support for upstream SOCKS proxies
Headless mode for unattended scripted usage
Support for more types of redirection
Support for NTLMv2 and IPv6
Numerous enhancements to Burp's extensibility
Greater stability on OSX
Have fun!