More than just a to-do list manager, Remember the Milk acts like a full-blown calendar, but without the row-and-column display. Separating your life into Personal, Study, and Work tasks (categories you can change), you enter task reminders as you would in any other calendar.
An easy to use, online to-do list. Get organized, stay motivated, and be more productive.
Follows a GTD approach and allows for tons of customization.
Great features such as SMS reminders, Collaboration, Notebook, Time Tracking, etc.
Awesome iPhone app with push notifications.
Also, has a great community in the forum with developers that pay attention.
TaskWriter is a flexible productivity solution that naturally fits your way of doing things. Just a few special features TaskWriter offers : the customizable dashboard view which allows you to keep an eye on the big picture, email integration in two different flavours, data export to (almost) every format you might think of, browser and iCal / Google Calendar / RSS integration.
CompVersions allows designers to easily show their clients multiple images and collect feedback on those images.
CompVersions can also be used by any creative firm/individual (designer, photographer, architect, ad agency, etc.) to get feedback from their clients on their images.