Microlite20 was written by Robin V Stacey in 2006 with the goal of being:
… a trimmed-down, subminiature version of [Dungeons & Dragons third edition] that has been designed to be quick and easy to play. The goal was to create a simpler game, but one where all of the resources of [D&D] (monsters, spells, adventures and equipment) could be used without conversion.
Microlite5E is my attempt to do the same for Dungeons & Dragons fifth edition. It should make character creation very quick and reduce the number of fiddly bits that a player has to keep track of. Characters should be balanced with existing fifth edition characters and be able to complete normal fifth edition adventures.
Changes: Microlite5E keeps all class features, but simplifies weapon and armour choices, replaces skills with broader proficiencies, reduces races to a single feature, prompts an optimal ability modifier array and discards ability scores to use modifiers only.
It also comes with a two-page monster creation system that should make DMG-legal monsters.
An example character:
Sage Tiefling Monk.
STR +1, DEX +4, CON +2, INT +0, WIS +3, CHA -1.
HP 10, HD 1d8, AC 17, Saves proficient STR and DEX (+2), advantage on Tiefling
Two unarmed +6 (1d12+4), dart +6 (1d6+4)
Skills Tiefling, Monk, Sage
SQ unarmoured defence, martial artist; hellish rebuke 1/day, resist fire; Researcher
Equipment shortsword, 10 darts, dungeoneer’s pack, a bottle of black ink, a quill, a small knife, a letter from a dead colleague posing a question you have not yet been able to answer, a set of common clothes, belt pouch (10gp)