yWhois (Online Tool)
yWhois is a free website that lets you look up the registration details of domain names, ASNs, and IP addresses. Super fast and easy to use!
LibreKB (Open Source Project)
LibreKB is a free, open-source PHP/MySQL/Bootstrap based knowledge base web app. Easy to use and quick to install, you can create a knowledge base for your users or customers in just a few minutes. LibreKB has the features you need, like categories, search, user management, and effortless branding.
BarkWP (Open Source Project)
BarkWP is a two-part solution to conveniently manage multiple WordPress sites. Free and open source, it consists of a WordPress plugin called BarkWPlugin and a management web app called BarkWPanel. BarkWP is a great time-saver for any person or business who has to maintain multiple WordPress websites.