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gedit
Homepage: http://projects.gnome.org/gedit/
gedit is the built-in text editor for Gnome users. Unlike Windows’s Notepad, however, it’s much more than a text file editor. It supports line numbers, line highlighting, bracket highlighting, automatic indents, syntax highlighting, modelines, Python consoles, code snippets, and much more. There’s also a wonderful “external tools” plugin, which allows you to utilize scripts like automatic building, remove trailing spaces, or opening terminals. If you code for a living, you probably need something more powerful. But if you just need a basic feature set, look no further than gedit.
To install gedit on non-Ubuntu machines (like Kubuntu), use the gedit package.
gPHPEdit
Homepage: http://www.gphpedit.org/
If you code primarily in PHP, you may prefer using gPHPEdit. Created by Andy Jeffries, and maintained by Anoop John, gPHPEdit supports HTML, PHP, CSS, and SQL highlighting. More uniquely, it also supports auto-completing PHP functions, auto-completing parameters, and a function browser. It also has built-in support for lint, and an integrated PHP manual. All of it comes in a nice, tidy, simple, Gnome-based interface.
To install gPHPEdit, use the gphpedit package in the universe repository.
Bluefish
Homepage: http://bluefish.openoffice.nl/
If you need something more powerful than gedit, and code in something other than PHP, give Bluefish a try. This fourteen-year-old project is much more mature than many of its competitors, so it has a lot more advanced features. With support for over a dozen languages, code snippets and wizards, regex searching, external scripts, autorecovery, FTP syncronization, and much more, it’s practically a fully-featured IDE. Unlike many of its peers, however, it’s fairly lightweight and not incredibly resource-intensive.
To install Bluefish, use the bluefish package in the universe repositories.
KompoZer
Homepage: http://kompozer.sourceforge.net/
If you prefer GUI editing over hard coding, give KompoZer a try. It’s based on Nvu, an old now-unsupported editor, itself based on Mozilla Composer. After 2006, however, Nvu’s development ended. KompoZer took up the slack. It supports both WYSIWYG and source editing. That means you won’t have to handcode things like tables or paragraphs, but you can also insert more advanced code. All this comes in a platform-neutral IDE that looks good in both Gnome and KDE.
To install KompoZer, use the kompozer package in the universe repository.
Quanta Plus
Homepage: http://kde-apps.org/content/show.php?content=10135
If you liked KompoZer, you may also want to try out Quanta Plus. It’s a KDE application that works as a WYSIWYG editor, a source editor, or, best of all, both at the same time. Like its well-known commercial competitor, Dreamweaver, Quanta Plus supports a “Split Screen” mode, where you can use either the “VPL” (Virtual Preview Layout) mode or the source mode. It also integrates well with the other KDE apps, like Konsole and Cervisia. It also supports lots of more advanced IDE features. The only real downside is that it never got ported to KDE 4.
To install Quanta Plus, use the quanta package in the universe repository.