cal.X is a Cocoa-based program, displaying a window showing the current month. Users can jump to past and future months and years, as well as jumping back to the current month. If the current month is being displayed, todays date will be highlighted yellow. Any space in the calendar not being taken up by the current month will be used to display dates from adjoining months (using a grey text color). Users can write a small note for each day of each month. Clicking on a day in the calendar highlights it blue and displays the note for the day (if any). Days with notes attached will be highlighted in a light grey color. If there is a note for todays date, it will be displayed when the program is launched. cal.X is free, and donations are accepted! Source code is available from the product homepage.