“The Wargaming Site” has a tutorial on making suppression markers from felt pads.
gaming aids
Tabletop Teasers Archive
The Tabletop Teasers Archive offers a downloadable collection of Charles Grant’s classic Tabletop Teasers — a series of articles he wrote for various magazines over the past 30+ years. each a military conundrum in the form of a scenario. They’re terrific.
Paper Tally Wheels / Tracking Dials
A freebie from RPG Now is a pdf for creating your own tracking dials / tally wheels. They’re intended for Villains and Vigilantes, but they’d be perfect for a huge variety of miniature, board, and card game — anything where you have to keep track of hits, actions, mana or what-have-you.
Innovative Casualty Markers
Ministories has a nice idea for casualty markers.
Map Tiles For Miniatures Gaming
Grey Wolf offers a large collection of map tiles for gaming.