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The Open Komodo Project, based on the award-winning Komodo IDE, is a new initiative by ActiveState to create an open source platform for building developer environments. ActiveState has open-sourced elements of Komodo Edit, a free multi-language edit
Geany is a text editor using the GTK2 toolkit with basic features of an integrated development environment. It was developed to provide a small and fast IDE, which has only a few dependencies from other packages. It supports many filetypes and has some nice features.
Visual Studio Shell (integrated mode) does not contain any programming language, so it provides the perfect foundation to deploy a development environment for your own language.