Converts NSP (Nintendo Switch Package) a.k.a. eShop games or DLC to XCI (NX Cartridge Image) Format - davFaithid/NSP-to-XCI-Converter
Switch Army Knife is a free tool which can easily convert Switch Roms from NSZ to NSP, and XCZ files to XCI. Download here for free...
A simple batchfile to convert Nintendo Switch nsp files (digital format) to xci files (cartridge format) based in LucaFraga's hacbuild - julesontheroad/XCI_Builder