Update non-free.md (#574)

Add Duet under Project Management.
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Edreih Aldana 2016-06-24 20:14:04 -05:00 committed by Edward D
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## Project Management
* [Active Collab](https://www.activecollab.com/) - Project management - `⊘ Proprietary` `PHP`
* [Duet](https://duetapp.com/) `⊘ Proprietary` - Invoicing and project management with an integrated client portal ([Demo](https://duetapp.com/demo/#dashboard)) `PHP`
## Self-hosting Solutions
* [Axigen](https://www.axigen.com/mail-server/free/) - `⊘ Proprietary` Great alternative to open source. It's a turnkey messaging solution, perfect for small & micro businesses, integration projects or test environments.