Linux Softwares to Net Promoter Score (NPS)

ZipBooks is an online accounting platform designed for small businesses, offering tools for invoicing, expense tracking, time tracking, and financial reporting. It aims to simplify bookkeeping and financial management for entrepreneurs.

LimeSurvey is a powerful, free, and open-source online survey application written in PHP. It supports various database backends and is distributed under the APL license. Offering extensive features for creating, distributing, and analyzing surveys, it's a flexible alternative to commercial survey tools.