An all-purpose code generator/modeler, probably template-based, that can generate code in one or multiple (mixed) languages, with a dedicated, easy IDE (no tangled command-line tools), where you can develop and maintain your entire application from scratch, would be nice!
This generator/modeler would let you work on your model, and never on the resulting code (no round-trip necessary).
Do you know any such product, or is this still utopic?
Take a look at http://www.codesmithtools.com/
"a template driven source code generator that automates the creation of common application source code for any language (C#, Java, VB, PHP, ASP.NET, SQL, etc.)."
There's also www.mygenerationsoftware.com, but they only advertise support for "Template Based Code Generator Supporting Four Template Languages - JScript, VBScript, C# and VB.NET."
Also, look at the suggestions from this question: http://stackoverflow.com/questions/93595/do-you-generate-code-if-so-what-do-you-use-and-what-do-you-generate
Do you mean code generators for DAOs, XML parsing and generation, Serialisation, end-language model code, etc, from a model definition? Obviously business logic would be something else, unless you were going to handle that with a rules engine like JBoss Rules.
Axis 2 for Java can take a model definition as .xsd and generate a Java model and XML. DAOs could be handled by Hibernate, etc.
But I am not aware of any specific tools (although that CodeSmith looks pretty useful to me now I've had a look at it), although I have been thinking of generating such a tool for my own projects (writing DAOs, XML, etc, bores me to death otherwise), but a few pages in a notebook does not make a usable project :)
For Visual Studio, there's T4 and this addon
There are also Blueprints
http://channel9.msdn.com/wiki/softwareplusservicesblueprints/