Leon - Leon is a scheduling software for aviation that helps to manage day to day aircraft operations with sales, crew, OPS & maintenance features.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
AMC Aviation - Airline Maintenance and Engineering
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
Awery Aviation ERP - Awery Aviation ERP is a complete integrated web-based flexible and customizable platform developed in close cooperation with aviation professionals.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.