Nonpareil is a microcode-level simulator for HP calculators introduced between 1972 and 1982, including the HP-35, HP-45, HP-55, HP-25, HP-34C, HP-38C, HP-41CV, HP-11C, HP-12C, HP-15C, HP-16C, and other models. The necessary microcode is included, as is a microcode assembler. The GTK+ toolkit is used for the user interface.
wzdftpd is designed to be a small, efficient, and highly modular/configurable FTP server for various platforms including Linux and Windows. The server is RFC compliant, multi-threaded and can be configured entirely online using SITE commands. You can write your own extensions to the server in your choice of language, extending on existing MySQL, PostgreSQL, SQLite, Tcl, Perl, PAM, and SFV plugins. Features include IPv6, TLS/SSL, UTF8, ACLs, VFS, events, scripting, plugins, job scheduler, bandwidth limitations, credits/sections, group administration, and customizable logging.
Lasso (Liberty Alliance Single Sign On) is an implementation of the Liberty Alliance specifications. These specifications define protocols for federated identities, single sign-on, etc. Lasso supports ID-FF 1.2, SAML 2.0, and parts of ID-WSF. It provides both a C library and bindings for several languages (Python, Java, Perl, PHP 4, and PHP 5).
GNU VPE creates a virtual ethernet by creating host-to-host tunnels between multiple endpoints. Unlike other virtual private "network" solutions which merely create a single tunnel, it creates a real network with multiple endpoints. It is designed to be conceptually simple and straightforward to setup (assuming prior IP routing knowledge) without sacrificing flexibility. It is designed to sit on the gateway machines of company branches to connect them, but it can also be used to tunnel into a VPN with a variety of protocols (RAW IP, ICMP, UDP, TCP, HTTPS-Proxy, DNS).