Gantter

From Volodymyr Mazepa:

Gantter is a free (gratis) web-based project management tool. You can think of it as a web-based Microsoft Project. It helps you to: plan and estimate your project (duration, work, cost) by splitting the project into a number of tasks; review you plan using Gantt chart; manage project resources (work or material) and assign them to tasks; manage project calendars (set working times, add holidays etc); manage resource calendars (working times, vacations etc); control your project's progress by setting % complete values to each task; review critical tasks