How to put apps on iPhone without using iTunes?

Well my old laptop broke and so I got a new one. My phone is stll synced with the iTunes from the broken laptop so if I sync it with the new laptop everything on it will get deleted, and I really don't want that to happen. I've found a way to put music and videos on my phone without using iTunes, but my phone is jailbroken, and I want to know if there's a way to put apps on my iPhone from my computer without using iTunes.

The AppStore?

If you have Wi-Fi, then itunes store built in app will work just fine.

Http://www.i-funbox.com/ is a great little program for jailbroken devices.
you can backup apps, install apps, etc.

Use iStore from your iPhone to get apps!