How do i know if any of these apps are Backdoored?

The Chrome launcher is fully open source and the code is included. You can even compile it yourself with our portable version of NSIS Portable (ANSI) or a regular installs of NSIS ANSI. You're right to ask about Chrome Portable as it has to do some machinations to be able to make your passwords portable.

Chrome doesn't use its own encryption engine to encrypt your passwords, it just uses Windows. A side effect of that is that your passwords are tied to the local machine. This doesn't make them safe, though, as any app on that local machine can use the Windows API to decrypt them. So, we have our launcher decrypt the passwords to carry around portably and the recrypt them for each local Windows machine you run on. Of course, you wouldn't really want to carry them around in plaintext, so the launcher can also encrypt them as you carry them around using a 'master password' of your choosing. You need to enable both options with a GoogleChromePortable.ini file as explained in help.html.

As for being sure our stuff does what it says, all our tools and our platform are open source. And you can find reviews of our products from every major computer reporting publication and website within our About - In The News section going back to 2004 when I started working on Firefox as the very first portable app on my personal website (still open source, of course).