If you're just starting a new website and don't want to spend too much money on HTML editor, you can use following 8 freeware that listed below. They ALL support Windows, Mac, and Linux/Unix Operating System.
1. Komodo edit. It is a swift and comprehensive code editor freeware by ActiveState Software. It features syntax coloring, background syntax checking, folding, and intelligent auto-complete system. It also fill with other unique functionality such as: Fast Open for files, macros & code snippets, shell command integration, cloud deployment with Stackato, and many more.
2. Aptana studio. Currently rebuilt from the ground-up, this amazing web development IDE has become much faster with enhanced customization and stacks of brand new productive features. It focuses mainly on the Java Script and Rich Internet Applications. It supports mos popular and advanced browser technology such as HTML5, CSS3, Python, etc. 
3. Seamonkey. This
project uses similar source code to Mozilla and fully supported by the
Mozzila Foundation. It includes an Internet browse, email client,
newsgroup client, IRC messaging, web development tools, and most
importantly - HTML editor. It is a project that's continuously developed
to deliver perfect solution for all your internet utility needs, whether it's for business or personal uses.
4. Amaya.
This amazing freeware is a Web editor for creating and updating
documents online. It was first developed in 1996 mainly as an HTML + CSS
style sheets editor. Nowadays, it has improved to support XML and its
various applications.
5. Kompozer.
It is a very easy to understand Web Editor freeware that was mainly
designed for beginner and non-technical users for creating professional
looking website. It doesn't requires deep savvy of any HTML or web
coding technique. The most awesome features is that it combines web file
management and simplistic WYSIWYG (What You See Is What You Get)
editing.
6. Netbeans. It is an Integrated Development Environment (IDE) software that have won multipe awards as on of the best and most comprehensive IDE freeware. If you wanted to build a professional looking applications using Java platform, then NetBeans is the best choice. The newest version fully supports JavaFX 2.0 with tools for visual debugging of Swing and JavaFX user interfaces.
7. Bluefish. It is an amazing editor mainly for programmers and web developers. It is filled with many comprehensive options for writing websites, scripts, and programming code. It supports most popular operating system including Windows, Mac OS X, Linux, FreeBSD, OpenBSD, and Solaris. 
8. Eclipse. It is the perfect solution for those who's needed an in-depth and complex IDE editor with multi platform supports and various languages. It supports various platforms such as JavaScript, Java, PHP Plugins, C++ Developer, RCP & RAP, and many more.