Check the list for awesomeness

[johnjago]

Sindre emphasizes that an awesome list should be a curation of the best, not everything. Considering how long this list has grown, it's time to once again go through the list and make sure that what is here is indeed awesome.

Some indicators that something on the list isn't awesome anymore:

• It is no longer maintained
• Competitors have advanced further
• The project no longer exists
• It is very well known in the developer community (for example, Git)
• The choices are obvious (the section on browsers)

Feel free to submit pull requests for this cleanup!