Fast ISO8601 date parser and writer for iOS & Mac.
Ruby strftime generator
Gantt chart (or date range visualiser) library for jQuery
Free scheduling for a meeting or event (premium version without ads).
Posted back in April, but still useful. Includes Singles365 and WhiteLabelDating.com.
Now in the UK…
Enter a date using natural language
Measure Map offers its Flash date slider selector for download - including FLA