Duolingo

General

Replay audio slower

`Ctrl` + `↑ Shift` + `Space`

All hotkeys for Duolingo

General Submit your answer, continue onto next screen	`⤶ Enter`
General Select multiple choice answers with numbers	`1`
General Select multiple choice answers with numbers	`2`
General Select multiple choice answers with numbers	`3`
General Move upwards through choices in dropdown list	`↑`
General Move downwards through choices in dropdown list	`↓`
General Replay audio	`Ctrl` + `Space`
General Replay audio slower	`Ctrl` + `↑ Shift` + `Space`

Similar combinations for other applications

dbForge SQL Complete

Show the hint with the info parameter for functions

General

`Ctrl` + `↑ Shift` + `Space`

PyCharm 2018.2

Code Completion filtering the lookup list basing on expected type.

Advanced editing

`Ctrl` + `↑ Shift` + `Space`

Evernote for Windows

Remove Formatting

Note Editor

`Ctrl` + `↑ Shift` + `Space`

Nuance Power PDF

Pause / continue reading

Read aloud

`Ctrl` + `↑ Shift` + `Space`

Microsoft FrontPage

Insert a nonbreaking space.

Edit and move text and graphics

`Ctrl` + `↑ Shift` + `Space`

Microsoft Word 2016

A nonbreaking space

Insert special characters

`Ctrl` + `↑ Shift` + `Space`

E-Sword

Insert non-breaking space Editors only

General

`Ctrl` + `↑ Shift` + `Space`

Adobe Premiere Pro (Windows)

Play In to Out

Multi camera

`Ctrl` + `↑ Shift` + `Space`

IntelliJ IDEA (Windows, Linux)

Smart code completion

Editing

`Ctrl` + `↑ Shift` + `Space`

Microsoft Visual Studio 2017 (Most used shortcuts)

[Text Editor, Workflow Designer] Edit.ParameterInfo

Edit

`Ctrl` + `↑ Shift` + `Space`

Chromebook and Chrome OS

Switch between the keyboard languages that you've set

Text editing

`Ctrl` + `↑ Shift` + `Space`

LibreOffice Impress

Non-breaking spaces. Non-breaking spaces are not used for hyphenation and are not expanded if the text is justified

Editing text

`Ctrl` + `↑ Shift` + `Space`

Brackets

Show Parameter Hint

General

`Ctrl` + `↑ Shift` + `Space`

LibreOffice Writer

Non-breaking spaces. Non-breaking spaces are not used for hyphenation and are not expanded if the text is justified

General

`Ctrl` + `↑ Shift` + `Space`

Google Sheets

Select all

Common actions

`Ctrl` + `↑ Shift` + `Space`

Google Translator Toolkit

Show placeholder menu

Translation

`Ctrl` + `↑ Shift` + `Space`

Delphi

Invoke code parameter hints

General

`Ctrl` + `↑ Shift` + `Space`

Visual Studio Code (Linux)

Trigger parameter hints

Rich languages editing

`Ctrl` + `↑ Shift` + `Space`

Visual Studio Code (Windows)

Trigger parameter hints

Rich languages editing

`Ctrl` + `↑ Shift` + `Space`

Microsoft Excel 2016

When an object is selected, this shortcut selects all objects on a worksheet

Other useful shortcut keys

`Ctrl` + `↑ Shift` + `Space`

Microsoft Visual Studio 2017 (All shortcuts)

Edit.ParameterInfo

Workflow Designer

`Ctrl` + `↑ Shift` + `Space`

Notepad++

Launch function completion ListBox

Edit menu

`Ctrl` + `↑ Shift` + `Space`

SQL Server Management Studio (SSMS)

Display parameter information

Microsoft IntelliSense

`Ctrl` + `↑ Shift` + `Space`

Android Studio

Smart code completion (filters the list of methods and variables by expected type)

Writing code

`Ctrl` + `↑ Shift` + `Space`

Opera

Open selected link in background tab

Link keys

`Ctrl` + `↑ Shift` + `Space`