Apkenv
Apkenv is a compatibility layer for applications packaged as ".apk", runs on Harmattan (N9) and Fremantle (N900).
"This project is a proof-of-concept on how applications targetting one platform can be made compatible with not so much effort as initially thought."
Official apkenv page (Details and download)
Frequently asked questions
Do I need NITdroid?
Nope. But you may need Bİonic libraries, download them from thp.io and place them on the same folder you placed apkenv.
"Permission denied" message
Run this: "chmod +x apkenv", then ./apkenv, It should work now.