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Stuff:
Printable calendars (one whole year on one page)
Monthly calendar graphics
CSS clock demo
Arithmetic quiz for computer or smartphone
Draw poker game in JavaScript
Two-player scoreboard "app" --
I also have three-player and
four-player versions.
NOTICE: The scoreboard "app" uses a cookie to store your score. No personal information is collected.
Big green digital clock -- it gets the time from the server, but displays it as your local time.
NOTICE: ↑ The clock at this link uses a cookie to keep track of the last time that the page was loaded. No personal information is collected.
I also have a client-side version which just uses your device's internal clock for the time, and which does not use cookies.
A beautiful Japanese calendar which shows your device's date and time, and an explanation of that calendar.
I also have another version of that calendar, which shows the date and time in Japan.
This calendar's graphics are from an old Dynax game called Mahjong The Mysterious Orient (麻雀東洋の神秘).
I used information from koyomi8.com to figure out the Japanese lunar calendar date.
A calculator "app" that can do time calculations