Brief summary of options available for both Infoga--a Python utility designed to gather email addresses from a given domain--and PhoneInfoga--a Python utility designed to gather information about a supplied phone number.
Shodan is a search engine that specializes in returning results for public facing devices on the Internet. The CLI tool allows you to make requests using an API to obtain results without using the Web UI.
QCAD is a free, open source application for computer aided drafting (CAD) in two dimensions (2D). With QCAD you can create technical drawings such as plans for buildings, interiors, mechanical parts or schematics and diagrams. QCAD works on Windows, macOS and Linux. QCAD Professional is the paid version that includes additional advanced drawing tools and supports more file types, most notably AutoCAD dwg and MicroStation dgn files.