Froala Design Blocks - 170+ free responsive design blocks based on Bootstrap 4
Fig - Fast, isolated development environments using Docker.
Webflow Flexbox UI Builder - Build flexible, responsive layouts — without writing code
Teleconsole - Teleconsole is a free service to share your terminal session with people you trust.
Antetype - Antetype - Layout aware User Interface Design - responsive and future proof.
Shell Notebook - MacOS Terminal, reimagined