Qustodio - Free parental control software. Monitor and track your child's online activity. Block dangerous sites and protect kids from online bullying.
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
NxFilter - Best performance. You don't want to slow down your network by installing a network security software. NxFilter is a light-weight DNS filter. It doesn't cause any latency issue in your network.
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
K9 Web Protection - This also contains the feature “Blacklist Without Password” which allows non-admin users to add sites to the “Always Block” list without requiring the K9 admin password.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.