LetDown is a TCP flooder that has an (experimental) userland TCP/IP stack, and supports multistage payloads for complex protocols, fragmentation of packets and variable TCP window.
ReverseRaider is a domain scanner that uses brute force wordlist scanning for finding a target subdomains or reverse resolution for an IP range. It supports permutation on wordlist, IPv6 and some DNS options.
Httsquash is an HTTP server scanner, banner grabber and data retriever (there’s a GUI interface for it). It can be used for scanning large ranges of ip for finding devices or HTTP servers. It supports IPv6, various HTTP requests and experimental fingerprint, based on httprecon signatures.