Kamailio (formerly OpenSER) is a high-performance SIP (RFC3261) server with a flexible architecture and many extensions. The server implements proxy, registrar, redirect, and location SIP/VoIP services. It has support for UDP, TCP, TLS, and SCTP transport layers, DNSsec, ENUM, AAA via database, RADIUS, DIAMETER, gateways to SMS and XMPP, least cost routing, load balancing, NAT traversal, and call processing language. Kamailio implements SIMPLE presence and instant messaging extensions, and inclu
Messenger GTK is a convergent GTK messaging application using the GNUnet Messenger service. The goal is to provide private and secure communication between any group of devices.
Converse.js is an instant messaging client for websites. It provides an entirely browser-based Jabber/XMPP interface, and can connect to any XMPP public server. Converse implementes single and multiuser chats, invitations, service discovery, direct registration, contact lists, roosters and vCard exchange, status changes and messages, typing and state notification, and OTR encryption.
EasyRedisMQ is designed to be a light weight message queue system that is built on top of redis. It is complete written in C#. It is not trying to compete with full featured message queue systems such as RabbitMQ. However, it also has more features built in than the basic redis pub/sub implementation. If you don't need a full blown message queue system such as RabbitMQ but the built in pub/sub features of redis are not enough, then EasyRedisMQ may be the right solution for you.