- @February 29
 - Links and information for leap day and leap year babies. - History of Leap Year Days
- Discusses the history of leap year day February 29th, and Julius Caesar's role in its origin.
- Honor Society of Leap Day Babies
- Dedicated to all things leap year, most importantly birthday party planning.
- Leap Day
- Graphs and tables explaining the occurence of Leap Day in the past, present, and future. From Eric Weisstein's World of Astronomy
- Leap Year Day Dot Com
- Includes a calendar of leap year facts, links, projects, and more.
- Leap Year/Leap Day
- Offers information about the day and year, including how to calculate their occurrence, historical events that fall of February 29th, and more.
- Worldwide Leap Year Festival
- Offers information about past leap year festivals, it's history, and more.
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