Notion
Write, plan, collaborate, and get organized — all in one tool. Write connected notes with rich format and Export to markdown, pdf, etc.
Whimsical
Visual workspace, online tool for quick diagrams
Detexify
Anyone who works with LaTeX knows how time-consuming it can be to find a symbol in symbols-a4.pdf that you just can't memorize. Detexify is …
Undraw
Open source illustrations
Unsplash
Free high resolution images.
Speaker Deck
Share your slides with others and find interesting slides.
Gimp
Create and edit images
Inkscape
Create SVG graphs
Mathematica Slide Show
Mathematica can be used to create interative slides.
Beamer
slides.com
Make dynamical slides with synchronous presentations over all devices.
Amphetamine App
Amphetamine keeps your Mac awake during presentations.