ActiveCollab

activeCollab is a web-based project management and collaboration tool, founded in 2006.
History
activeCollab was launched in 2006 by Ilija Studen as an open source software. It subsequently, in 2007, became proprietary software developed by A51.
Initially it was available as a self-hosted version only. In 2013 the cloud version was introduced.
Features
Projects are divided into milestones, tasks and subtasks. Projects also include files, discussions and notebooks for collaborative writing. Time tracking, Invoicing and Notebooks modules are also available. In 2013, activeCollab launched an iOS app for cloud users under the name Manage Projects.
API
API is available for connecting activeCollab to other apps. activeCollab integrates with payment gateways including Paypal, Authorize.Net, Stripe and Braintree, which enables receiving payments within the system.
 
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