indico is privileged to have a large, active developer community. Nothing makes us happier than helping you show your work to the world. That said, we have enough submissions that we can't put everyone's up. Here are some of the things we look for:
Usability - Your demo could be the first thing that a new user sees. We want to make sure the experience is great from start to finish. Your project should include cues letting the user know that everything is alright. This can be as simple as a loading bar, or as complex as google's dinosaur game. A user should know that the project is working (or not), and understand what steps to take next.
Presentation - Appearance is almost as important as functionality. You don't need to be a photoshop wizard, but using a decent color scheme goes a long way. We would hate to see someone ignore your project just because it looks like Windows 98.
Open source - All projects in the indico gallery MUST be open source. The goal for these projects is that they become foundations for the projects of others. This is much easier when someone can work on a fork of the original project. Preferred licenses: MIT, BSD, MPLv2
All projects should include the phrase "powered by indico", though it doesn't need to be prominent.