Late in the evening i installed some native apps on the iPhone .
I began with the Terminal application.
With SSH it’s a piece of cake : just push the Terminal.app (for the iPhone) to the /Applications folder from the iPhone by scp, then give the execution right to the binary (Terminal.app/Terminal) by ssh (chmod +x) .

Then i continued with the Voice recorder : This application records the voice as an .arm file (that can be read with QuickTime) in the /var/root/Media/Voicerecordings folder of the iPhone. Then get it by scp on your Mac/PC to read… Some says it can record the conversations during a call..cool.

Finally i installed the Installer Application : this applications when launched, shows you applications (Doom, Launcher) as packages to install on your iPhone.
With this Installer, i installed the Launcher Application … as there is no scrolling on the SpringBoard of the iPhone, if you have a lot of applications installed, some are hidden.
So open the Launcher and simply chosse an application to run.

Here are some pictures :

Terminal

No more free space

Installer application

Launcher application