CosmosMUD: How to Plan an Area - Provides tips on what to consider when planning a MUD area. - http://cosmos.wolfpaw.net/areabuild/areadoc.html
Area Swap Yahoo! Club - Discussion site for area builders. - http://groups.yahoo.com/group/areaswap/
Make ZonesFast - Off-line area editor for ROM, Merc and Envy codebases. - http://www.snible.org/mud/mzf.html
Lunar Eclipse OLC and Building - Concluse guide to using ROM OLC (version ROM2.4b). Gives detailed information and guidelines for the essential commands. - http://lunar.betterbox.net/olc.html