Open Source: Open Source Scripting Made Easy: This is an article about PHP scripting tools that makes an important point:
Commercial scripting languages have drawn success from powerful and widely used development tools: ASP has Visual Studio, ColdFusion has Macromedia’s Dreamweaver, and JSP has a variety of tools from commercial sources such as Borland and open source projects such as Eclipse and NetBeans. PHP’s enormous success, however, is not tied to specific tools.
Some friends of mine have been working with Microsoft’s .Net platform. They tell me it’s amazing (“fan-friggin’-tastic,” one of them called it). This is great, but I guess I don’t like anything where the barrier to entry is so high — first you have to have a Windows server, then you have to have the Windows dev environment.