Dia – Free software for creating technical diagrams similar to Visio

Dia is roughly inspired by the commercial Windows program ‘Visio,’ though more geared towards informal diagrams for casual use. It can be used to draw many different kinds of diagrams. It currently has special objects to help draw entity relationship diagrams, UML diagrams, flowcharts, network diagrams, and many other diagrams.
wiki.gnome.org/Apps/Dia

Another free alternative to Visio is Openoffice draw. Read more here: https://chase-seibert.github.io/blog/2009/03/26/openoffice-draw-vs-visio.html#

Bulma: Free, open source, & modern CSS framework based on Flexbox

Bulma is a free, open source CSS framework based on Flexbox and used by more than 150,000 developers.

  • responsive mobile first
  • css only framework
  • sass
  • supports modern browsers
  • partially supports ie10+
  • easy to understand and readable css classes

Site: bulma.io

Getting started with bulma video:  https://www.youtube.com/watch?v=MchBPICewgs