There are many open source softwares that can help you as a web designer.
Here are the softwares can help you simplify the process of making a website.
1. SeaMonkey Firefox is developed by the Mozilla Foundation. SeaMonkey is an "all-in-one" web browser that is simple yet but it's very good for the HTML editor.
Download: http://www.seamonkey-project.org/
2. NOTEPAD + +. NotePad + + is an open source apps that is very popupler as a text editor for Windows. Although not solely for web designers but these software have a "source code editor" editor that supports HTML, XML, CSS, and JavaScript.
Download: http://notepad-plus.sourceforge.net/uk/site.htm
3. Quanta Plus. Quanta Plus is a web development IDE. Quanta Plus is very extensible and can run custom scripts. This application is good for editors css because it has code hints and auto complete syntax.
Download: http://quanta.kdewebdev.org/
4. OPEN BEXI HTML Builder. OPEN BEXI HTML Builder is a browser-based open source software for creating HTML web pages. OPEN BEXI HTML Builder has a built CSS color picker.
Download: http://sourceforge.net/projects/ob-htmlbuilder/
5. jEdit. jEdit is a text editor for programmers. jEdit can run on Mac, Windows, and Linux and have facilities "syntax highlighting" for HTML, XML, CSS, JavaScript and other programming language. Download: http://www.jedit.org/
6. KompoZer. KompoZer is a fully-featured web authoring system that
is integrated FTP client that is intuitive and support for all operating
systems.
Download: http://kompozer.net/
7. Bluefish Editor. Bluefish Editor is a lightweight and fast to
process the editor intended for web designers and programmers. Wizards
have a useful facility for the manufacture of an HTML document.
Download: http://bluefish.openoffice.nl/
8. Amaya. Amaya is a free apps, open source web editor and web
browser developed by the World Wide Web Consortium (W3C). Amaya started
as an HTML / CSS editor and has grown to become an editor for a variety
of XML-based systems such as MathML and SVG.
Download: http://www.w3.org/Amaya/
