STUFF I'VE MADE
Kid Pix Deluxe 4 Sample Pack
A pack of every sound effect from Kid Pix Deluxe 4, useful for making annoying music. My friend compiled this :)
Adobe Flash Player - Last version of Flash that doesn't kill itself. Make sure to set to never check for updates. You'll need a browser like Pale Moon since the plugin is unsupported by modern browsers.
Windows Movie Maker - This is the last version, released in 2012 with Windows Live Essentials. Just uncheck everything else in the installer. There's also 6.1 from Vista and 2.6 from XP, but they have compatibility issues with Windows 10 in my experience.
Windows XP games - Minesweeper, Solitaire, and other ad-free classics from XP.
Want to find something online? Just add "archive.org" or "reddit" to the end of the search.