rga: ripgrep, but also search in PDFs, E-Books, Office documents, etc.
Backup Emails from 99+ Email Clients for Free with Just Few Limitation
Free Email Backup Software | Email Backup App for Android
Award-winning modern data processing in C++17/20
A Born Again Christian Linux Distribution
Common Resource Grep
An open source search engine with RESTFul API and crawlers
Mac OSX style and feel on the latest Cinnamon Desktop
Ubuntu Power: All-In-One Ubuntu version
although fully functional, this is a pre-framework that you can extend