Download UFDG-3.7/Ngspice

Click on UFDG.Linux-Packet.tar.gz (~8.0MB), which you have to decompress (gunzip UFDG.Linux-Packet.tar.gz) and untar (tar xvf UFDG.Linux-Packet.tar). The resulting directory includes the UFDG-3.7/Ngspice executable, documentation, circuit simulation examples, and the UF COPYRIGHT.