Trilium Notes - Trilium Notes is a hierarchical note taking application.
Mailinator - Any Inbox. Any Time.
Quick Code - Curated list of free online programming courses
TempMail.altmails - Disposable temporary email addresses
Pocket Coder - Coding JavaScript on the go
Harakirimail - Harakirimail is a free disposable email service. Just send email to anythingyouwant@harakirimail.