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Bluefish is a powerful editor targeted towards programmers and webdevelopers, with many options to write websites, scripts and programming code. Bluefish supports many programming and markup languages.
Lightweight - Bluefish tries to be lean and clean, as far as possible given it is a GUI editor.
Fast - Bluefish starts really quick (even on a netbook) and loads hundreds of files within seconds.
A What You See Is What You Need interface
Multiple document interface, easily opens 500+ documents (tested >10000 documents simultaneously)
Project support, enables you to work efficiently on multiple projects, and automatically restores settings for each project.
Multi-threaded support for remote files using gvfs (depending on your gvfs setup, you'll have FTP, SFTP, HTTP, HTTPS, WebDAV, CIFS and more).
Very powerful search and replace, with support for Perl Compatible regular expressions, sub-pattern replacing, and search and replace in files on disk.
Open files recursively based on filename patterns and/or content patterns
Snippets sidebar - specify custom dialogs, search and replace patterns or insert patterns and bind them to a shortkut key combination of your liking to speed up your development process
Integrate external programs such as make, lint, weblint, xmllint, tidy, javac, or your own program or script to handle advanced text processing or error detection.
Integrate external filters of your liking, pipe your document (or just the current selected text) through sort, sed, awk or any custom script.
Unlimited undo/redo functionality
In-line spell checker which is programing language aware (spell check comments and strings, but not code), requires libenchant during compilation.
Auto-recovery of changes in modified documents after a crash, kill or shutdown
Character map of all unicode characters (requires libgucharmap during compilation)
Upload / download synchronisation
Full screen editing
Many tools such as tabs to spaces, join lines, lines to columns, strip whitespace, etc. etc.
Customizable programming language support:

In-line reference information (move your mouse over a function name or tag name) for various programming languages
Code block folding
Highlighting matching block start and end markers (both brackets and tags)
Auto-completion and auto-tag-closing for many programming languages, with reference information, and even for nested languages (e.g. css and javascript inside html code that is inside a php document)

with included language definition files for:

Ada
ASP .NET and VBS
C/C++
CSS
CFML
Clojure
D
gettext PO
Google Go
HTML, XHTML and HTML5
Java and JSP
JavaScript and jQuery
Lua
Octave/MATLAB
MediaWiki
NSIS
Pascal
Perl
PHP
Python
R
Ruby
Shell
Scheme
SQL
SVG
Vala
Wordpress
XML

Multiple encodings support. Bluefish works internally with UTF8, but can save your documents in any desired encoding.
Bookmarks functionality
HTML toolbar and tearable menu's

Dialogs and wizards for many HTML tags, with all their attributes
Fully featured image insert dialog
Thumbnail creation and automatically linking of the thumbnail with the original image
Multi thumbnail generation for easy creation of photo albums or screenshot pages
User-customizable toolbar for quick access to often used functions

Compliance with the Gnome and KDE user interface guidelines where possible