So, can D100 games alone actually capture the feel and mechanical needs of the periods I am (or may) be interested in? Lets look at the options period by period. The bracketed (#) value is the relative “hardness” or realistic tone of the option with 1 being soft pulp, 3 middle of the road and 5 being very gritty, italicised titles are not at hand (owned) and the bold titles are realistic non d100 options.
Stone Age survival/exotic encounter; Legend has a 40,000bc book (4) and BRP is easy enough (3).
4000bc Ancient history/fantasy; Mythras has just launched a highly regarded Babylonian book (4).
Greek legend: The core Mythras book is Bronze Age based (4), with a Greece supplement slated, OQ; Jackals (3)
Ancient Rome historical/fantasy; Mythras/Legend has the Mythic Rome and Gladiators books (4), CoC has an option also (3) .
Early Dark Age historical/fantasy; Mythras/Legend for Mythic Britiain (4) and Vikings of Legend (4) Cthulhu Dark Ages (3), D100 Dungeon (3)
Medieval historical/fantasy; Legend/Deus Vult (4).
Medieval Asian culture historical/fantasy; Samurai of Legend (4), DwD Art of Wuxia (1)
Medieval high fantasy; Magic World (3), Mythras (4), Legend (3-4), Bare Bones Fantasy (1) 13th Age (3)
Medieval low magic fantasy; BRP (3), Legend (3-4), The One Ring/AIME (3-4), Mouse Guard (3)
Dark, gritty fantasy; WHFRPG 1/4e (5/4), Zwiehander (5)
Renaissance dark horror; Clockwork and Cthulhu (2), WHFRPG 1/4e (5/4)
Renaissance historical/weird science; OQ; Clockwork and Chivalry (3)
Pirates; Pirates of Legend (4), BRP; Blood Tides (3), Pirates and Dragons (3)
1890’s horror/mystery ; Cthulhu by Gaslight (3), Legend; Historia Rodentia (4), BRP; Aces High (4), BRP; Devil’s Gulch (3).
1920’s to WW2 pulp/horror; Call of Cthulhu (3), Achtung Cthulhu (2), Weird War Cthulhu (4), Astounding Adventures/BRP (2).
50’s Horror/sci fi; Worlds United (3), Weird War Cold War (4), The Laundry ‘50’s (3).
Modern horror/urban fantasy; Mythras/The Vampire Wars (4), The Laundry (4), Delta Green (4), Cthulhu Now (3) Signs and Sigils (5)
Post apocalyptic; Seasons of Death for Mythras (4-5)
Modern black ops; Covert Ops (2), BRP or Mythras base (3).
Space Opera Sci Fi; DwD Frontier Space (2) Mongoose Traveller 1e (3), Star Wars d6 (2)
Hard Sci Fi; M Space (3-4) Mongoose Traveller 2e (3-4)
Far Future Fantasy; BRP/Future Earth (3).
Trans Dimensional; Mythras; Luther Arkright (4)
Supers; Superworld/BRP (3-4), Destined for Mythras (4-5), Many Others (1-5)
Lots of options.