Great list

This is a great list. May I bring your attention to Helpmonks — http://helpmonks.com?

Helpmonks is the ridiculously easy way to keep your team email organized. Something I’m sure some of your readers will love.

We do have paid accounts, however Helpmonks you can have a free account for one shared inbox with three users. Additionally, Helpmonks is free of charge for any open source project or non-profit organization.

Thank you.