Notepad++ supports all kinds of fonts and languages but in order to do that you will need to select the proper encoding system. You can do that by going into Encoding > Character Sets > Hebrew > ISO 8859-8. Then you will need to go to Regional Settings from Control Panel and add Hebrew keyboard support. It's more convenient this way than to install fonts. Once you complete this, switch to Notepad++ with encoding mode selected to the above mentioned ISO and then press Left Alt+ Left Shift to change your keyboard into Hebrew mode and type whatever you need to.