PortSifter is a beta tool, which allows you to load nmap output files in a table for easier preview, filtering, etc. It has some builtin filters, result highlighting and a few other features that make large scans easier to understand.
PortSifter is currently under development with many new features already in the pipeline. Sign up to receive notifications when updates are available.
Even More Awesome Features
This tool includes many more awesome features you may not about.