MathType - The Professional version of Equation Editor- MathType is a powerful interactive tool for Windows and Macintosh that lets you create mathematical notation for word processing, web pages, desktop publishing, presentations, and for TeX, LaTeX, and Math…
draw.io - Online diagramming application
KLatexFormula - KLatexFormula is an easy-to-use graphical application for generating images (that you can drag and...
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
LibreOffice - Math - Math, LibreOffice, math editor, ODF, OpenFormula, open standards
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.