Nozbe is a Getting Things Done task management program. This program also offers both Personal and Team Accounts. Three options exist for personal accounts: A free plan offering only five projects at a time, a solo plan allowing 100 projects for $7/month, and a Plus plan for those with up to 1,000 projects for $14/month. There are two options for team accounts: Family (up to six users, 1400 projects) $24/month and Team (up to 15 users and 4,000 projects) $49/month. All accounts offer a discount for pre-payment.
Nozbe allows you to create "Next Actions" in each project, so you can focus on only one action item at a time. This makes it a great program for team projects containing lots of task dependencies. You can also upload files related to tasks - so that you will have whatever you need in order to complete your to-do list.