UProc for Sheets - Boost your sales, marketing and IT tasks from Google Sheets
Grist - Grist makes it easy to transform spreadsheets into a custom database where data is truly actionable.
Mattermark in Salesforce AppExchange - Automatically enrich leads in Salesforce with Mattermark
Rows - The spreadsheet where teams work faster
TrackingSuite - TrackingSuite is an all in one leadgen, website auditing , seo , crm prospecting tool.
Email Verification on Google Sheets - An add-on for email verification directly in Google Sheets