Feng Office (formerly known as OpenGoo) is a free and open source online project management and collaboration tool, licensed under the Affero GPL 3 license.
PHP & MySQL/SQLite -based Project Management System
MyT (Manage Your Team) - is a free open source task management and project management system, based on Yii Framework, easy to use and with a great perspective of growth for the future.
You can create one or more Projects and manage several types of Tasks for each one. You can also create and manage Timesheet hours.
Myt can send email notifications based on some events, such as Task assignments and Project associations. All features are configurable from the Administration Panel.
Features: web2.0 project- & task-management, timetracking, team organizing, resource management, calendar, interface for your clients and lots more! Content: see license.txt (file section).
A PHP-based flexible software package for contact management, project management, and team collaboration. Office features include call logging, time tracking, and task management. Features bookmarks, document libraries, calendars, wikis, forums, & more.
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Mailer-Project is a free full-featured mail-exchange script (or so-called paid-mailer written in PHP4/5 which lets you easily setup a complete mail-promotion service including email and web templates, ticket system for your members, task management and many more.
A complete map analytics platform with task management. OpenBizMap matches user data with Eurostat and Wikipedia to show it on GoogleMaps. Users can send tasks directly from the map.
workbase is a web based work/task management system intended for small companies that allows allocating tasks to employees and managing projects with little effort
This project and task management software written in modern XHTML/Javascript/PHP/MySQL follows a wiki-like scheme of editing content for simple organizing of people.
Mighty Office is an integrated task management and billing solution. Advanced Project Management and Task Delegation tools will speed workflow. Less advanced features, like the Time Log, and Invoice Generation abilities can make any office mighty.
phpDesktop is a light-weight, multi-user organizer, including interconnected modules for scheduling, task management, contact management, and file storage; targeted towards ease of use, associative labeling, and support for full meta-commenting.
ITMS gives users the ability to assign and manage tasks in an organization. ITMS sends task assignment notifications and reminders via email. Implemented in PHP, ITMS supports MySQL, Oracle, LDAP, and SSL.
Webager is a webPHP/My SQL based task management solution for buisness people and educational institutions. Users can log in and see which tasks/assignments they need to do as well grades/quality of work for projects and the average average.