Perhaps Explorer++ is the solution you are looking for.
With the option to save to the registry or a configuration file,
Explorer++ is completely portable
Tabbed browsing for easy management of multiple folders
Display window shows previews of files as they are selected
Easy-to-remember keyboard shortcuts for quick navigation
Customizable user ...
I would suggest you jump on the developer side of that problem and edit your prose using Asciidoc format. There are quite correct editors (as an example AsciidocFX). This is quite a simple format (more or less like Markdown), but it will allow you to include code with ease, and apply really good text formatting.
One such program is called Allway Sync, in which one creates a backup (synchronizing profile) and sets the parameters to recognize a specific detachable device. External hard drives and flash drives are supported, as are networked drives.
I've used this for clients with limited understanding of the systems. It allows them to insert the flash drive and ...
It is not open source, but it is free -> Free version.
It is cloud based (OneDrive)
Privacy? It is not a zero-knowledge solution, so you have to trust. See privacy section below.
Platforms: PC (Win7+, Pre-installed on Windows 10), Mac, iOS, Android, and the web
Can be used standalone, but of course it integrates well with other 365 apps: ...
QOwnNotes is a flexible solution that can sync with various clouds of your choice like ownCloud, Nextcloud, Dropbox, Syncthing, Seafile or BitTorrent Sync... Looks like any file syncing software is supported, but it'll work better if you have a server of your own and use platforms with a special note taking API like ownCloud or Nextcloud
It can also import ...
This can be done with a combination of Python & OpenCV - both are Free, Gratis & Open Source and cross platform.
You can find a good write up and example in the PyImageSearch People Counter.
Picture is from the PyImageSearch web site.
Most grep tools can only search for a single regular expression. With PowerGREP you can use up to five sets of search terms. Each set can use an unlimited number of regular expressions.
Not free but neither is our time
If you are really serious about tagging, using taxonomies, and searching using them, then I would suggest a document management system such as Alfresco.
You can add metadata to any type of file, be it a PDF or a GIF or even some unknown binary format
Metadata can be of several types:
Tags: Lightweight, you can create new tags on the fly
I can recommend FileLocator Lite/Pro, it belongs to my set of indispensable tools. While I don't use it the same way as you would, with strings on several lines, this should be possible if you are experienced with the RegEx syntax.
You can use Splashtop Wired XDisplay HD – Extend & Mirror 4+:
gratis but might become non-gratis in the future ("**** LIMITED TIME Launch Special (Regular Price: $19.99 USD)" according to the iOS App store)
works with macOS and Microsoft Windows
iOS App store ratings: 3.8/5 (186 Ratings)
I'd suggest ColorNote
simple notes application: Very Straight forward
shared between my laptop: available in the Windows app store, Easily syncs between devices
has its own cloud: can backup to it's own servers
venerated as secure? Option available to encrypt data
Evernote is another cross-platform solution which I've used for almost 10 years.
It has versions for Android, iOS and Windows;
In Windows, it can be installed both traditionally via a wizard and as an UWP app via Windows store (just go to https://evernote.com/download on your device).
You can find more information regarding privacy and security here. It ...
Google Keep is available on web, Android, iOS and all platforms that can run Chrome. There are 2 official extensions you can find on the store: Google Keep Chrome Extension and Google Keep - Notes and Lists. I have no idea what the differences between them are but both can run offline and can be pinned to the taskbar to run as PWA desktop app
I have been using Simplenote and Standard Notes for years.
Both are FOSS and have their own mobile apps. For desktop I use their web editor, but they also have Windows app if you want to use it in desktop while offline.
I invite you to have a look at my application SilentNotes;
It is a FOSS application which I have developed with a strong focus on privacy.
The notes can be synchronized end-to-end encrypted between multiple Android and Windows devices and can be self-hosted. Currently supported are the FTP protocol, the WebDav protocol, Dropbox, Google-Drive and One-Drive.