I believe that being able to block access to countries that you do not have any legal recourse only seems logical. If you can't touch them, why should they be able to touch you?
IMHO, completely blocking traffic from specific countries is a week attempt to improve security or defend against "hackers" attacks. It might work for single individuals in households, but it's a very, very bad idea from a methodical point of view. And stateting that blocking traffic from Russia and China has helped the author may be offending to certain persons. I have a suggestion to make to improve the program: instead of blocking by country, block by political ideologies. Block communists... ;-P
A database subsetting tool that exports relational data into various formats.
A MIDI filter that uses the ALSA MIDI libraries to provide configurable filtering functionality.