Amaya

Amaya is a powerful open-source application used for Internet browsing, document creation and authorizing under HTML.

This feature-rich application contains powerful tools for working with HTML files and allows the users to create or edit websites. This tool makes web designing an easy job for everyone, as the users don't need to know programming languages in order to create websites.
It is highly customizable, as it allows the users to edit the formats, and use various themes and styles for improving the appearance of the websites. The application comes with a nice GUI that allows the users to make quick changes upon websites without actually working with codes that do that. Amaya comes with self explanatory examples that will allow the beginners to get familiar with the piece of software, as well as some tips at the start-up of the program that prove to be useful.
All in all, you should give Amaya a try; it is a free open-source application especially developed to make web designing more accessible for everyone, and it is available for multiple OS, which increases the program's applicability.