Exposes an API
Project Management/Team Collaboration Tools

These project management solutions and/or online team collaboration tools expose an API (a.k.a. as an Application Programmer Interface) that is both documented and supported. These APIs allow 3rd parties to create add-on functionality and allow ambitious users to implement organization-specific custom functionality.

Not all APIs are created equal though. Some APIs only allow automation of the most basic of features whereas others are as full-featured as the services themselves. Be sure to fully research a solution's API before you dive head-first if you are going to need to use it's API. Caveat Emptor!

Note:
We have not fully researched all the solutions to determine which do and which do not have APIs. If you represent a solution or you know of one that has an API but is not listed here please email us the URL for their API documentation.

@task

Link to @task Project Management at pm-sherpa.com

@task is a web-based project and portfolio management software application. @task has worksheets, interactive Gantt charts, customizable templates, portfolio overviews and they claim to welcome and incorporate customer feedback. @task is also database, platform, and browser independent and can communicate with existing systems.

Celoxis

Link to Celoxis Project Management at pm-sherpa.com

Celoxis is a web based project management software. It offers project templates, Microsoft Project import, time sheets, expenses, web folders, discussion forums and more. It offers a workflow system where you can model and track your business processes like issue tracking, help desk, etc. Celoxis is cross platform and cross browser (supports Safari on Macs) [...]

5pm

Link to 5pm Project Management at pm-sherpa.com

5pm is the new version of the project management tool we’ve been using for years. The customizable interface was designed to make the maximum use of screen space, and everything is within a click or two. Check the visual timeline for an alternative view of your projects/tasks.