Update non-free.md (#574)

Add Duet under Project Management.
pull/589/head
Edreih Aldana 9 years ago committed by Edward D
parent 6277cdfa93
commit bbc30056c9

@ -51,6 +51,7 @@
## 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.

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