Bartender — keep the mac menu bar extremely clean. Great for sharing your screen.

BetterTouchTool — customize EVERYTHING: gestures, shortcuts & more ... Great community. Build with 💛 in Munich.

CleanShot X — best screenshot tool. Let's you quickly add arrows, blur text, and more.

CloudMounter — mount cloud storage as local drives in Finder.

Itsycal — tiny, clean menu-bar calendar with event peek.

Numi — calculator that understands text, units, currency, time, … and sticks on top of the screen.

Noun Project — extremely fast and nice looking icons (also as SVG)

Paste — searchable, synced clipboard history for Mac & iOS. Extremely useful.

Permute — dead-simple media converter (video/audio/images).

Presentify — draw on screen, cursor highlight, spotlight & zoom. Great while sharing your screen.

Setapp — subscription service bundling 200+ premium Mac/iOS apps.

TextSniper — OCR anything on screen to clipboard in one shot.

TripMode — block background traffic to save hotspot data.

Note2Self Mail — quickly send yourself notes by email in one tap.

Make It Big — display huge fullscreen text for quick communication.

Jagdwetter — best way to determine when it's going to be dark outside ("Büchsenlicht").

Wappalyzer — detect tech stacks of websites at a glance.

Pick color from page — eyedropper & color tools (HEX/RGB/HSL).

Just One Page PDF — save page/selection to a single PDF.

SVG Export — grab SVGs from any site (also PNG/JPG export).

And of course my own extensions ...