Trello is a web based project management solution.

MyLifeOrganized (MLO) is the most flexible and powerful task management software for getting your to-dos finally done.

Taskulu is a Flexible task management, realtime chat, time logs and deep integrations.

Dapulse is a smart collaboration and communication app you can use to get your team members working in sync in one place.

BigTime provides simple online time tracking and invoicing app for QuickBooks.

DeskTime is a real-time time tracking service that analyzes productivity.

Asana is a web and mobile application designed to help teams track their work.

Time Doctor is a SaaS time tracking and productivity tool.

Avaza is a beautiful online software suite with modules for Project Management, Timesheets, Expenses & Invoicing. Access from anywhere, with any device.

TimeCamp is an advanced time-tracking app which also offers a variety of reporting, billing, and invoicing features.

Calvetica is a fast calendar for iPhone and iPad.

taskblitz is set of tools to collaboratively get your work done including project management, chat, time tracking and invoicing.