An emulator of the Czechoslovak single-board computers PMI-80, Savia-84 and Stone 1. Their original monitors run on the emulator's own 8080 and Z80 cores, with the display, keyboard and sound modelled as on the real boards. In the browser, offline or as a Windows EXE.
A pocket-sized ham radio clock on the tiny OLED of the Heltec WiFi LoRa 32 V3: UTC, solar and propagation data, the nearest ionosonde and live PSKReporter spots of the stations that hear you, on a list and a map. Installed and set up straight from the browser.
An emulator of the Science Fair Microcomputer Trainer (Radio Shack 28-260, 1985), the American version of the Gakken FX-Micom R-165. Its own TI TMS1100 core runs the trainer's original program with the monitor and the seven built-in games. In the browser, offline or as a Windows EXE.