Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
FCorp ID Book - ID Book is a handy, easy to use application specially designed to offer users a simple address book.
Magic Spreadsheet - Human workforce and AI plugged into your Google Spreadsheets
EuroOffice - EuroOffice is free and open source office software built on OpenOffice/LibreOffice.
Sheetsu - Turn Google Spreadsheet into API
Redmine - Flexible project management web application