ical is an old but popular calendar package written in Tcl/tk by Sanjay Ghemawat for Unix systems. ical is known for its simple, intuitive interface. It's also easy for Tcl/tk programmers to extend ical with custom functionality. It stores all calendaring information in a single flat text file per user that may be easily parsed by other programs. ical is free software released under the GNU General Public License.
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