The best IDE alternative to Silex is Adobe Dreamweaver. It's not free, so if you're looking for a free alternative, you could try Bluefish Editor or Foopad. If that doesn't suit you, our users have ranked more than 100 alternatives to Silex and three of them are IDEs so hopefully you can find a suitable replacement.
Advanced web authoring tool supports designing and coding tasks from a visual perspective and backs it up with robust coding. Offers live preview, customizable templates, endless design options, and tools like drag-and-drop visual design capabilities, FTP/SFTP transfer, and supports multiple monitors.
Adobe Dreamweaver is the most popular commercial alternative to Silex.
Bluefish is a powerful editor targeted towards programmers and webdesigners, with many options to write websites, scripts and programming code. Bluefish supports many programming and markup languages, and it focuses on editing dynamic and interactive websites.
The biggest, most important difference between BlueFish and Silex is that Silex is WYSIWYG while BlueFish is totally code-oriented!
Foopad is nondestructive source code editor / integrated development environment made to make your dev life better. Foopad has some unique features and can be customized to be like simple notepad or full IDE.
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Dreamweaver is low-code where Silex is primarily no-code (add code if you need to) Also Silex is a modern online tool