Description: GeoGebra is free and open-source dynamic mathematics software for all levels of education. It combines geometry, algebra, spreadsheets, graphing, statistics and calculus in one easy-to-use package. It can be used to teach math from elementary through university level.
Type: software
Pricing: Open Source
Description: Robtex is a free online tool that provides various utilities for investigating IP addresses, domains, autonomous system numbers (ASNs) and more. It offers whois lookups, DNS information, routing data, hosting details and network ownership records.
Type: software
Pricing: Free