Components used ...

... on the client side:

• Stanford Javascript Crypto Library (SJCL) for decoding and encoding blog posts, comments and images
• Bootstrap 4 - the popular css (and javascript) framework (from twitter)
• JQuery - the famous javascript library
• JQuery Validation Plugin - client form validation
• Marked - markdown parser and compiler
• ImgZoom - a smooth image zoom effect
• Moment.js, moment-timezone.js - datetime and timezone conversion
• Font awesome - icon font

See the licenses details.

... on the server side and during the build process:

• Flask - flask is a web microframework (uses jinja2 and werkzeug)
• Google app engine - platform as a service for web development (python)
• LESS less extends CSS with dynamic behavior
• JSHint - a javascript code linter
• Selenium/PhantomJS - for test automation
• ... and maybe many more.