For quick and effortless web development - Quanta Plus is steadily becoming a worthwhile competitor to the commercial web editors on the market.
Quanta Plus's features include multi-document interface, WYSIWYG editing and templates. Among the advanced features your will find team development, plug-in support and a PHP debugger.
Quanta Plus is a highly stable and feature rich web development environment. The vision with Quanta has always been to start with the best architectural foundations, design for efficient and natural use and enable maximal user extensibility. We recognize that we don't have the resources to do everything we would like to so our target is to make it easy for you to help make this the best community based desktop application anywhere.
Pretty much everything in Quanta is designed so you can extend it. Even the way it handles XML DTDs is based on XML files you can edit. You can even import DTDs, write scripts to manage editor contents, visually create dialogs for your scripts and assign script actions to nearly any file operation in a project. You can even look at and communicate with a wide range of what happens inside Quanta using DCOP.
Quanta is based on KDE so this means it is network transparent from any dialog or project. It can use not only FTP but other KDE KIO slaves from file dialogs or in project settings.
For instance if you want secure access try the fish KIO slave that uses SSH. Just enter fish://[user]@domain in any dialog or select fish in your project settings. Here on this site you will find information on using Kommander to visually build dialogs you can extend Quanta with.
These applications talk to each other using an IPC (Inter Process Communication) called DCOP (Desktop Communication Protocol).
You can download it here.