Designed for use on all operating systems and web servers, Blosxom has little in the way of requirements. You need:
A web server, running either on your local desktop or an account at your local service provider
The ability to run CGI scripts
Command-line or FTP access to the server
To aggregate RSS feeds using Blagg, you also need a command-line application capable of fetching a remote resource over the Internet; typically available are Curl, Lynx, or Wget
Any Internet service or web hosting provider worth its salt makes this base level of functionality available to users.