Adobe AIR, as it is no longer beta, will be more popular for sure.

I had collected 10 Adobe AIR -Must See- Applications in a previous post which contained really cool applications.

Klok is another great Adobe AIR application which is built for personal time tracking. Projects, sub-projects (tasks) can be defined and can be attached to a customer. You can even make a "start & stop" to calculate the time of the task you worked on and Klok automatically adds it to the timetable.

Klok's UI works with the drag'n drop logic in general. You can send the items to the trash, manage the timetable and the projects hierarchy easily with dragging and dropping the items.

Klok is a very handy and easy to use application for freelancers & other individuals who want to keep track the time of tasks and projects they are working on.

TaskFreak! is an open source, ajax interfaced, web based task manager written in PHP.

It is similar to a project management software but concentrated more on tasks and does not have features like milestones, files or messaging. This makes TaskFreak! simpler but less complicated.

Some TaskFreak! features:

• Projects
• Tasks
• Deadlines
• Color based complete status & priority levels
• Ajax interface
• Users – task assignment

TaskFreak! says the application is GTD compliant (Getting Things Done – very nice post) and it offers 2 versions: single user & multi-user.

ProjectPier is an open source, self-hosted PHP project management application which helps connecting teams, organizing projects & tasks through a web interface.

It’s code is based on activeCollab, which was a popular free project management application & became paid later on.

ProjectPier has an active community which discusses about the software, creates themes & translations.

Some features of ProjectPier:

• Multi-client capability lets you manage projects of different clients simultanously
• 3-Level rights management:
  1. Administrator
  2. User of owner company
  3. User of client company
• Possibility to limit rights of client users per project
• Messages and task lists can be linked to milestones
• Versioning can be used to manage revisions of uploaded files.
• Tags can be used to categorize messages, tasks, milestones, and files
• Fulltext search per project covering messages, tasks, milestones, and files
• Privacy: Messages, tasks, milestones, files, and comments can be flagged as ‘private’, hiding sensitive information from clients

Collabtive is a free PHP project management software with a Web 2.0 looking, ajaxed interface.

The software is still in the beta phase but it already has the features like:

• Projects, Milestones, Taskslists, Tasks
• User management
• Message system
• Integrated instant messenger
• Multilingual
• Template system

Activecollab was one of the most popular free project management softwares that became a paid solution after sometime. If you are looking for an alternative which will run on your servers & have an open source code, take a look at Collabtive.

There are some nice upcoming features like a flash progress meter for the projects.

Redmine is a flexible project management web application. Written using Ruby on Rails framework, it is cross-platform and cross-database.

With a plain interface which makes the use easier, Redmine has most of the features a project managemnt software must have like multiple projects, role based access control, wiki & file management.

Redmine features:

• Multiple projects support
• Flexible role based access control.
• Flexible issue tracking system
• Gantt chart and calendar
• News, documents & files management
• Feeds & email notifications.
• Per project wiki
• Per project forums
• Simple time tracking functionality
• Custom fields for issues, projects and users
• SCM integration (SVN, CVS, Mercurial, Bazaar and Darcs)
• Multiple LDAP authentication support
• User self-registration support
• Multilanguage support
• Multiple databases support

Redmine is in beta status yet and improved regulary.