VCalendar (Virtual Calendar) is an open source Web calendar application with related tools, for posting and maintaining events and schedules online, in calendar format. This is an excellent and free solution for use by online Web communities and any commercial and non-commercial organizations. Unlike any other online calendars, VCalendar comes with source code in multiple programming languages: PHP, ASP and ASP.NET (C# and VB.NET); with potential for adding more technologies in the future.