Yappy provides a lexical analyser and a LR parser generator for Python applications. Currently it builds SLR, LR(1), and LALR(1) parsing tables. Tables are kept in Python shelves for use in parsing. Some ambiguous grammars can be handled if priority and associativity information is provided.
yencode is an encoder, decoder, and posting package for the popular Usenet yEnc encoding format. It features the ability to encode single or multipart archives, a smart decoder which can decode multiple files (including files specified out of order or with nonsense filenames), an optional scan mode with recursion, and an easy to use Usenet posting utility. It is fully compliant with the yEnc specifications.
Yersinia implements several attacks for the following protocols: Spanning Tree (STP), Cisco Discovery (CDP), Dynamic Host Configuration (DHCP), Hot Standby Router (HSRP), Dynamic Trunking (DTP), 802.1q, Inter-Switch Link Protocol (ISL), and VLAN Trunking (VTP). It helps the pen-tester in different tasks, such as becoming the root role in the Spanning Tree, creating virtual CDP neighbors, setting up rogue DHCP servers, becoming the active router in a HSRP scenario, enabling trunk, performing ARP spoofing over VLAN hopping, adding or deleting VLANs (via VTP), and more.