–Ekiga. An alternative to Skype; it is a software for video conferencing and VoIP available for Windows & Linux.
–Childsplay. Memory activities for children to learn sounds, images, letters, numbers…
–Dia. Diagram editor similar to Microsoft Visio.
–FreeCAD. 3D design software recommended for engineers and architects.
–Owncloud. An interesting alternative to Dropbox.
–MediaWiki. To create and manage a Wikipedia-like website.
–Bleachbit. It could be described as a CCleaner for Linux.
–GNUMed. Highly recommended for health professionals, as it allows you to create and manage patient histories.
–OCS Inventory NG. Web application that helps system administrators to keep a track on devices connected to a network and configurations and software installed in that devices.
–GLPI. It enables to create a database with an inventory of all devices in a network and implement job control with an email notifications system.
–Ampache. To configure a home media center or an audio or video online application and access it from anywhere with an internet connection.
–PDFEdit. Software to edit pdf documents.
–Lemon POS. It allows you to use a single database (MySQL / MariaDB) to storage data from multiple devices at the same time.
–OpenShot. Video editor for Linux.
–LAN Messenger. Program for IM communications over a LAN to share files, messages and event notifications.
For further info about any of these software, see the article in Tecmint