If you are serious about using your Raspberry Pi as a platform for writing and testing code, you'll appreciate the WebIDE software developed by Adafruit.
Is the conference before or after your publication date? What tasks do you need to complete in what order? Was Jean born before Derek? Was the Atari ST released after the Amiga? Timeline is a program that can give you fast answers to these kinds of question, typically at a glance.
nag is probably the simplest command-line task manager out there. But while this tiny Python script won't replace a full-blown task manager, nag can come in handy for maintaining a short list of tasks with a minimum of fuss.