What kinds of spreadsheet applications would not be considered m?

Spreadsheet applications that would not be considered mainstream typically include specialized or niche tools designed for specific industries or purposes, such as scientific data analysis software, financial modeling tools that integrate with databases, or customized applications built for particular organizational needs. Additionally, non-traditional applications like web-based collaborative tools that focus on data visualization rather than traditional spreadsheet functionalities may also fall outside the mainstream category. Examples could include software like MATLAB for engineering calculations or specific inventory management systems that use spreadsheet-like interfaces but aren't widely recognized as standard spreadsheet applications.