Cura
Ultimaker has built a 3D-slicing software called Cura. It is open source and easy to use. For advanced users, Cura offers up to 200 customisations. It runs on 64-bit platforms and has cross-platform support including Windows (Vista and above) and Mac OSX (10.11 and higher). Required system configuration is 4GB RAM, at least Intel Core 2 Duo (or equivalent) processor, OpenGL 4.1-compatible graphics chip and 205MB hard drive space. Cura 3.2.1, the latest version of Cura, comes with many bug fixes.
Pidgin
Instant messaging client Pidgin can be easily added as a plug-in and used. It is built on libpurple library and supports a host of messaging protocols and servers like MSN Messenger, Yahoo!, Google Talk and Bonjour, among others. It is customisable with a large number of third-party plugins. Pidgin runs on Windows, Linux and Unix operating systems.
Rocket.Chat
Rocket.Chat, a messaging and connectivity solution for enterprise use, follows strict security protocols including end-to-end data encryption, two-step authentication and authorised user access. In the latest version, it comes with features like file sharing, free audio and video conferencing, screen sharing as well as LiveChat, Group Sync and guest user sessions. It features real-time language translation (supports up to 37 languages) using a machine learning algorithm.
Openfire
Openfire, developed under Ignite Realtime Project in a community model, serves as a one-to-one messaging platform as well as a group messaging server. It is compatible with Windows, Linux and Mac OS. The latest version 4.2.3 brings many bug fixes and improvements. One of the latest implementations is Update HTTP File Upload Plugin. Fixes of S2S stream errors and better certificate usage allow admins to retrieve PEM representation of installed certificates.
Miranda IM
Miranda IM supports multiple messaging protocols like Yahoo!, Gadu-Gadu, AIM, Microsoft Messenger
Services, XMPP, IRC and more. It brings a number of additional plugins in the package, and can be further customised with 500 other plugins externally, such as Skype, Facebook Messenger, MySpace, Xfire and NetSend. It has a simple interface and is available exclusively for Windows.
DC++
For easy peer-to-peer file sharing, DC++ is a great tool. It is a free, open source file-sharing client that runs on Windows OS. It utilises Advanced Direct Connect and NeoModus Direct Connect protocols, connecting to Direct Connect network. The latest version of DC++ uses Tiger Tree Hashes for file integrity and brings a search feature for files across all connected hubs based on parameters like file name, size, type of file and hash. It supports auto-configuration on UPnP and Network Address Translation-Port Mapping Protocol routers. Shared files are secured via Secure Sockets Layer (SSL) encryption.
LAN Messenger
As the name suggests, this is an instant messaging client for a local area network (LAN). It does not require any separate server or even an active Internet connection for operation, and is accessible to authorised people within the network firewall. LAN Messenger provides reliable security through Advanced Encryption Standard (AES). It runs on multiple platforms including Windows, MacOS and Linux.
Psi
This instant messaging client works on XMPP protocol and is built on Qt toolkit. It, thus, brings a light, compact and easily-usable platform to users. Channeling on XMPP servers allows Psi to connect to other instant messaging clients like Google Talk and Gadu-Gadu, using the same protocol. It has a powerful SSL-based encryption system.
Rambox
Rambox brings multiple messaging clients like WhatsApp, Gmail, Outlook and others (total 96 services supported) under one common platform. It is highly scalable, allowing addition of custom services and custom codes. Users can channel Rambox across a proxy server for further privacy. It helps streamline all messaging services. Rambox provides cross-platform support.
