The online “Office” suite by Google is composed by Google Docs, Sheets and Slides. These great tools can boost both your personal and work productivity with the advantage to be online, you can access your docs everytime and from any device in every place you are.
The basic features provided by these tools can be extended by installing add-ons and make them more powerful, next a list of the most useful add-ons.
Google Docs add-ons
Doc Tools A set of single-click tools to change case, highlight text, sort tables and lists, change numbers to text, and more.
Translate Use Google Translate to translate text in your document.
Table of contents Automatically creates table of contents in the sidebar that can be clicked through, for easy document navigation.
Easy Accents This Add-on allows users to easily insert accents for different languages directly from a sidebar in their Google Doc.
Extensis Fonts Quickly access and use thousands of fonts from the Google Fonts collection in your documents.
Draw.io Diagrams draw.io is a free, Google Drive based diagramming Add-on for Docs.
Google Sheets add-ons
Yet Another Mail Merge Create email campaigns with Gmail and Google Sheets.
Power Tools Provides a set of tools for daily tasks: change case; sum by color; remove duplicates; split, merge, compare, find, clean up data and more.
ProjectSheet planning Create and modify a planning schedule for project management in a spreadsheet with WBS work breakdown and Gantt time chart.
Table Styles Apply a uniform style to your tables in one click.
AppSheet Build a custom mobile app from your Google spreadsheet.
Split Names Quickly split full names to several columns with first, middle, last names, titles, and/or post-nominal letters.
Google Slides add-ons
Icons by Noun Project Get access to over 1 million high-quality icons from Noun Project.
Insert icons for Slides Browse 1800+ icons from Font Awesome and Google Material Design, available in every colors and insert them in your slides.
Unsplash Photos Insert free, HD photos from Unsplash.
Lucidchart Draw diagrams and insert them directly into your Google Slides.
Slides Toolbox is a One-click solutions for daily tasks (tools for images, lines, shapes/text box, etc…).
Stickeroid Help to add stickers, transparent images, clipart, logos into your slides.
These are just some add-ons, you could give them a try, just browse them and you can find hundreds of add-ons!