opmlmerge is a console-based program to merge two or more OPML files together. Feeds are considered duplicate only if the title and the feed URL both match. Please note that Debian and RPM packages are auto-generated using Python's distutils, and as such don't have full dependency information. You need appropriate Python XML libraries installed to use this program; something like libxml2 should do.
VCF2alias is a tool to extract name and email information from VCF attachments (automatically if you use the enclosed mailcap), and writes a line (user-defined) to a file (user-defined). Originally, VCF2alias was aimed at mutt, but it should now work with any mail program that has text-file alias definitions.