Variety of app sources
The number of available applications is, of course, never cut and dry, because it depends on the Linux distributions. But a lot of thing still happen on the store side. Thus we treated the PackageKit back-end of the three stores that depended on it as a one single entity, no matter how many programs it could retrieve using conventional packages (DEBs, RPMs and so on).
We tried to identify extra sources of new software that could bring us more cool stuff, and that indeed bore some fruit. Scoring more
