Trilium Notes - Trilium Notes is a hierarchical note taking application.
BURN.link - Send secure, encrypted, self-destructing messages
Quick Code - Curated list of free online programming courses
sup3rS3cretMes5age - A safe, simple tool for one-time (self-destructing) messages
Pocket Coder - Coding JavaScript on the go
1ty.me - If you need to send a password or some other form of simple but sensitive information to someone...