PS3 applications and programs are released as .pkg files. The .pkg files install directly from the PS3's main menu. There are many different types of .pkg applications available for the PS3, and many of them are very useful. There are FTP servers, file explorers and even user-created games that can all be installed via .pkg files.
Download the .pkg file you want to install onto the PS3 from one of the many PS3 developer Websites.
Insert a USB flash drive into the computer and copy the downloaded .pkg file directly to the USB flash drive.
Pull the USB flash drive out of the computer and turn on the PS3. Insert the USB flash drive into the PS3.
Select the "Install Package Files" option from the PS3 main menu. Select the .pkg file that is on the USB flash drive from the menu that comes up. The .pkg file is installed.
Press the "O" button on the PS3 gamepad to go back to the PS3 main menu when the installation completes. The installed program is now on the PS3 main menu.