Land of the Lead has a set of one-page Napoleonics Rules. They’re designed for play with a “reinforced division” per side. Scroll down to the bottom of the page to find them.
napoleonics
The Immortal Memory
The Immortal Memory is a set of rule for refighting Trafalgar.
Le Baton Napoleonic Rules
Le Baton is a set of free wrgames rules for 15mm Napoleonics.
L’Orre Mixte Napoleonic Rules
L’Ordre Mixte is a Napoleonic Supplement to Fire and Fury.
Quick Napoleonics
Back when MWAN was still being published, it was my favorite wargaming magazine — in no small part because of the variety of interesting characters who wrote for the magazine. One of those was Friar Aelred Glidden, who is perhaps the world’s only wargaming monk. Glidden’s game rules were always simple, but interesting, and I very much miss reading his works.
Quick Napoleonics is a set of free wargames rules inspired by Friar Glidden.