What is the 'non-market' tag intended for?
We are speaking of sources for apps here. And in this context, 'non-market' stands for sources with, well, no market. Good examples include
- the developers' websites
- company websites offering their own apps for direct download
What are tags for other sources?
- google-play-store: Need I explain?
- amazon-appstore: Yepp, they have their own market as well
- alternative-markets: there are many more, e.g. AndroidPIT. But many manufacturers have their own special markets, e.g. Samsung, Archos, LG, ...