[$] Old-school calendaring at the command line with Remind
Remind is a command-line calendar and alarm program, with an optional Tk-based graphical interface, for Linux and Unix-like operating systems. It has its own scripting language that allows users to create reminders that are difficult (if not impossible) to specify in other calendaring programs. It is wholly unsuitable for use in corporate environments that require calendar sharing and exchanging meeting invitations; however, it may be precisely the calendaring tool for users who prefer the command line and fast, flexible tools that can help keep track of messy schedules.