If you’re a workflow developer on vRealize Orchestrator (f.k.a. vCenter Orchestrator), I would recommend to checkout flowgrab.com. FlowGrab is a community driven platform for workflow development collaboration. You can use the platform to upload and share your vCO/vRO workflows; together with a team or just as a solo contributor. The projects are published on the website and made available to other users of the platform.
For a first impression of FlowGrab, please watch this YouTube movie:
To learn what FlowGrab can offer you, just create a free account on flowgrab.com. The community version of FlowGrab provides a platform to share you vRO workflows with the other users. An on-premises version of the platform will become available in the future; this is useful for private workflow development.
I would recommend to explore the available workflows available in the portal, this gives you a good idea to see where others are working on. The available project are available for download, so maybe you will find something useful.
The guys behind FlowGrab recently released a vCO plugin which offers direct access from vCO to the FlowGrab portal. This makes it even more ease to download and share your workflows.
I would suggest to keep an eye on this new initiative as more functionality is added to the website.