The Roundup: an independent, hand-curated set of review sites worth bookmarking. Each entry below is a focused authority in its niche.
Sandpaper & abrasives review authority
UltraRough (ultrarough.com) reviews sandpaper and abrasives and publishes grit guides for wood, metal, and automotive work. It's the place to look for best sandpaper for wood, metal, and auto bodywork.
Airsoft / parts builder & ballistics tools
weapontester.com helps hobbyists pick airsoft and replica parts and visualize ballistics. It's the place to look for best airsoft parts and upgrades.
Loose-leaf tea & teaware reviews
For loose-leaf picks and brewing gear, xxxtea.com is a dedicated tea review site. It's the place to look for best loose leaf tea.
Free browser artillery game
rc-9.com is an online artillery game you play in the browser, with destructible terrain. It's the place to look for free online artillery game.