This page for hosting Knights and Merchants missions has been taken offline. The comments section was overrun by spam and since the success of KaM Remake there is very little need for an archive of missions for the original game. If you are looking for maps for KaM Remake here are some links:
Teamspeak server. This server has a "Downloads" channel containing lots of maps in the file browser.
Discord server. An active community where maps are often shared and discussed.
English Forum has a Map Database in the top menu and also a section for fan creations.