TinyCal

The TinyCal Project is a free and open source JavaScript calendar/date picker licensed under GPLv3 whose primary function is to illustrate how easily a fully functional and flexible calendar can be compactly implemented using nothing but JavaScript and CSS. Trying to make it lighter has become a bit of an obsession at this point, even though it weighs in at under 5k - far smaller than anything else out there that I have come across. In addition, the code is fully documented with the hopes that no one will ever have to include jQuery again solely because they need a calendar. TinyCal is platform and browser independent and has been fully tested in Chrome, Firefox, Safari, and Internet Explorer. Examples are included in the download.