Npcap is described as 'is the Nmap Project's packet sniffing (and sending) library for Windows. It is based on the discontinued WinPcap library, but with improved speed, portability, security, and efficiency' and is an app in the Network & Admin category. There are three alternatives to Npcap for Windows. The best alternative is WinPcap, which is both free and Open Source. Other great apps like Npcap are WinDivert (Free, Open Source) and Win10Pcap (Free, Open Source).
Win10Pcap is written as a personal project by Daiyuu Nobori, a Ph.D student of Computer Science of University of Tsukuba, Japan. The many parts of Win10Pcap was from WinPcap. Win10Pcap has the following additional features: