4D
Redis
LiveCode Platform
MongoDB
CouchBase
Azure Cosmos DB
ESM Tools
OrientDB
CherryTree
Zim Wiki
Cryptee
Trilium Notes
Joplin
OneNote
Evernote
Google Keep
CherryTreeCherryTree is ideal for students, writers, researchers, and anyone who needs to manage complex information in a structured manner. It is particularly suitable for individuals who appreciate hierarchical organization and who may require the functionality to include various types of content in their notes.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
Zim Wiki - Zim is a graphical text editor used to maintain a collection of wiki pages. Each page can contain links to other pages, simple formatting and images.
LiveCode Platform - It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...
Cryptee - Cryptee is a safety and privacy focused, encrypted and cross-platform personal data storage service. You can write personal documents, notes, journals, store photos and all sorts of other files.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Trilium Notes - Trilium Notes is a hierarchical note taking application.