MiniWebsvr is a small Web server that aims to one day be embeddable. It supports static Web pages, directory listing, HTTP MIME encodings, GET/HEAD/OPTIONS, and logging to disk. It has a small memory footprint, is multi-threaded, and supports command line options, conditional GET:, If-Modified-Since:, and range-bound downloads (download resuming).
Hunny Mail++ is a cross-platform C++ library that provides classes for SMTP, POP3, IMAP4, and NNTP clients. This mature toolkit, which has been in active development since 1997, offers many features, including support for TLS (SSL) and the most popular SASL authentication mechanisms, IMAP extensions, and NNTP extensions. The toolkit comes with well-written documentation and numerous example programs, making it easy to use.
ConceptDraw NetDiagrammer has been developed for professional computer network diagramming, LAN scanning and visualization, preparation of network documentation, and office/building/home network planning. It is intended for network administrators, IT directors, network designers and engineers, and for everyone who finds detailed network documentation, diagramming, and schematics critical. It includes large collections of task-specific shapes of network objects, as well as templates, samples, and easy-to-use wizards. It also allows drawing all types of UML diagrams, floor plans and office layout drawings, flowcharts and dataflow diagrams, workflows, and more.
uvlan is a User-space Virtual Local Area Network. In other words, uvlan peers act as nodes on a network switch. Ethernet traffic is routed between peers intelligently. This allows for multiple networks to share resources and even IP address space. Some may call it a VPN (Virtual Private Network) application, but it's much more powerful: it is peer-to-peer, is much simpler, and operates at layer 2 (ethernet). VPNs generally operate at layer-3 (IP), and layer 2 applications like gaming can't be supported with layer 3 tunneling.
Cyan Secure Web Proxy Server is a carrier grade, high performance Internet filtering proxy server for Linux. It includes scalable (user/group/host) Web filter and virus scan utilities for blocking malicious applications at the gateway. It has an advanced URL database, authentication support (Active Directory, LDAP, NTLM), SSL Interception, easy deployment, and remote administration.
The deepOfix Mail Server makes it possible for organizations with minimal technical expertise to have robust server infrastructure. deepOfix offers unprecented ease of use, doesn't require prior GNU/Linux experience and is backed by a full-time development and support team. deepOfix features LDAP-based directory services for user account management, email delivery, distribution lists, and addressbooks. It also includes built in tools for spam and virus control, webmail, and fetching email.