The Ultimate Google Sheet Toolkit - We put together a curated list of templates, videos, and tutorials that can help you build your analytics expertise.
Grist - Grist makes it easy to transform spreadsheets into a custom database where data is truly actionable.
Google Sheets + MonkeyLearn - Power up your Google Sheets with text analysis
Rows - The spreadsheet where teams work faster
SheetHacks by Polymer Search - Discover the best tips & tricks for Google Sheets & Excel
UProc for Sheets - Boost your sales, marketing and IT tasks from Google Sheets