Open Source Software for macOS
LibreWolf
A privacy, security and freedom focused web browser forked from Firefox. LibreWolf is always built from the latest Firefox stable source, for up-to-date security and features along with stability. It uses more than 500 privacy, security, performance settings, patches and LibreWolf-Addons, and is designed to minimize data collection and telemetry performed via Firefox's updater and crashreporter.
Jami
Jami is a free, open-source. universal distributed communication platform which preserves the user's privacy and freedoms. Jami supports a variety of video input options, including mutliple cameras and image and video files, and the selection of audio inputs and outputs with high quality audio and video codecs.
Freenet
Freenet is a peer-to-peer platform for censorship-resistant communication and publishing. With the Freenet client you can browse websites, post on forums, and publish files within Freenet network with strong privacy protections.
Chromium
Chromium is a free and open source web browser developed by Google. The project builds the open source version of the Google Chrome web browser. Google make use of the source code to build and improve their proprietary version of Google Chrome. And Google is not alone, many other browsers like Microsoft Edge, Opera and others a based on Chromium.
Qt Creator
Qt Creator is a cross-platform integrated development environment (IDE) built for the maximum developer experience. Qt Creator runs on macOS, Linux and Windows desktop operating systems, and allows developers to create applications across desktop, mobile, and embedded platforms.
Taskwarrior
Taskwarrior is an open-source, cross platform time and task management tool that can be used to effectivly keep track on progress and handle collaborative tasks. Taskwarrior's provides a graphical user interface as well as a command line tool allowing you to get things done and track progress from your terminal. Taskwarrior is powered by the Taskserver, an free and open-source server that can be installed on your cloud infrastructure or on-premise.
Jitsi
Jitsi is an open-source project and software toolset that allows you to easily build and deploy secure video conferencing solutions. At the heart of Jitsi are Jitsi Videobridge and Jitsi Meet, which let you have conferences on the internet, while other projects in the community enable other features such as audio, dial-in, recording, and simulcasting. Jitsi supports popular protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, Google Hangouts, OTR, ZRTP and more.
Nubo
Nubo is a self-hosted file sharing application that runs on macOS, Linux and Windows (64-bit versions only). The application consists of two parts, a cloud-base part which is s mall PHP application that must be installed on a server, and the client which can should be installed on your local machne to be able to syncronise and share with the cloud. In that sense Nubo is similar to other file sharing solutions in that you drop files into a special folder on your computer to save and sync with cloud instance.
Ripcord
Ripcord is a desktop chat client for group-centric services like Slack and Discord. It provides a traditional compact desktop interface designed for power users. It has a small resource footprint, responds quickly to input, and gets out of your way. With Ripcord, you can connect with friends, family and co-workers.
JDownloader
JDownloader is a free, open-source download management tool with a huge community of developers that makes downloading as easy and fast as it should be. Users can start, stop or pause downloads, set bandwith limitations, auto-extract archives and much more.