Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Invenio - Invenio is a free, open-source software to run a digital library or document repository on the web.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Greenstone Digital Library - Greenstone is a suite of software tools for building and distributing digital library collections...
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Koha - Koha is the first free and open source software library automation package (ILS).