Clearbit Salesforce Prospector - Quickly build targeted lead lists directly in Salesforce
Stein - Use Google Sheets as your no-setup database
TrackingSuite - TrackingSuite is an all in one leadgen, website auditing , seo , crm prospecting tool.
Sheetson - Instantly turn any Google Sheet into RESTful API
UProc for Sheets - Boost your sales, marketing and IT tasks from Google Sheets
Sheetsu - Turn Google Spreadsheet into API