The Open Komodo project provides a code base upon which integrated development environment (IDE) software packages can be developed. ActiveState's Komodo Edit 4.3 and later (an open source, multi-platform, multi-language editor) is an established, mature product that uses the Open Komodo platform.

With the Open Komodo Project, the focus is on dynamic languages and the open web. Open Komodo i...

Google App Engine exposes a fully-integrated development environment.

Google App Engine makes it easy to design scalable applications that grow from one to millions of users without infrastructure headaches.

Every Google App Engine application can use up to 500MB persistent storage and 5 million monthly page views, free.

Komodo Edit offers sophisticated support for all major scripting languages, including in-depth autocomplete and calltips, multi-language file support, syntax coloring and syntax checking, Vi emulation, and Emacs key bindings.

Komodo Edit is built on the Mozilla code base and versions 4.3 and later are licensed under the same terms as Firefox: Mozilla Public License (MPL), GNU General Public License (GPL), and GNU Le...

It is also the home of Pinax, which is a packaged collection of reusable Django apps forming an out-of-the-box Django-based website.

An important feature is use of Google's native 'Model' class to interact with the 'Big Table' database, rather than the Django ORM.

This has the advantage that you can use new datastore features as soon as they get released, and code optimized for the App Engine Datastore can be reused from both Django and WebApp projects.

Many optional, useful extras are provided in the companion 'rage...