Open Source Software for macOS
Vim
Vim dates back all the way to 1991 when Vim's author, Bram Moolenaar released it to the public. Vim is a highly configurable text editor built to enable efficient text editing. The software is released as free and open-source software under the Vim License. Vim is often called a "programmer's editor," as it relies more on customization of shortcuts and makes heavy use of macros that can be combined with muscle memory to achieve maximum proficiency. Vim was designed for use in both command-line interfaces and as a standalone application in a graphical user interface.
Atom
A free and open-source IDE for macOS, Linux, and Windows developed by GitHub Inc. The application is build on the Electron framework and provides a wide eco-system of add-ons that can be used to extend the IDE further. Atom is loved by developers across the globe.
FreeCAD
FreeCAD is a highly customizable, scriptable and extensible computer aided design software software for the, MacOS, Linux and Windows operating systems. With FreeCad you can model and design real-life objects in 3D through parametric modeling where all 3D objects you design are controlled by parameters. FreeCAD is released as free and open source software under LGPv2+ license, and can be used for commercial and hobby projects alike.
HedgeDoc
HedgeDoc, formerly known as CodiMD is an open-source collaborative markdown editor. HedgeDoc provides collaborative features that makes it easy for teams to work together by creating notes, graphs and even presentations in real-time. With HedgeDoc, all you need to get started is to share a link to your co-workers, and they can join you in the process.
Apache Mesos
Apache Mesos a free an open-source cluster orchestration platform. It allows you to allocate dynamic resource between applications and enables you to build fault-tolerant and elastic distributed systems. With Apache Mesos, your applications are only aware of the resources of a particular partition or machine they are running on. It also provides an abstract view of all resources used by any application in the system, where you can allocate resource, per application basis. Apache Mesos is battle-tested and industry proven to easily scale to 10,000s of nodes.
Swarmlet
Swarmlet is a free and open-source, self-hosted Platform as a Service that runs on any single server. It's mainly intended for use with multiple servers, a server cluster / swarm. Swarmlet is inspired by Dokku and brings the same simplicity to Docker Swarm. Swarmlet also uses Traefik v2 and Let's Encrypt to provide automatic SSL and load balancing on your apps.
Ruby
Ruby is a free and open-source interpreted, high-level, general-purpose programming language. The language was created by Yukihiro "Matz" Matsumoto from Japan in the mid-1990s. Today, Ruby has a friendly and growing community from all over the world and is openly developed and maintained. According to its creator Yukihiro, the language share many similarities with Perl, Smalltalk, Eiffel, Ada, Basic, and Lisp, all of which Ruby was influenced by.
neo4j
Neo4j is a commercially provided graph database management system developed by Neo4j, Inc. The graph database is fundamentally different to the relational model found in relational database management systems (RDBMS). With Neo4j, each data record, or node, stores direct pointers to all the nodes it's connected to. The database is also designed to perform complex queries with complex connections orders of magnitude faster. Neo4j is ACID-compliant and suited for projects that requires complicated relationship structures.
Unreal Engine
The Unreal Engine is a game engine and suite of tools and technologies developed by Epic Games. The engine was first released in 1998 as a part of the first-person shooter game Unreal, where the game itself was built on the engine. Today the Unreal Engine has grown into an ecosystem that includes a marketplace for game assets that can help indie developer to develop games and make a living selling game assets them selves. The Unreal Engine is free to use and provides a revenue-share model for developers and has been used to tipple A studios and indie developers to create games in almost every genre, including platformers, fighting games,RPGs, MMORPGs, and many more.
Sozi
Sozi is a free and open source, browser-based presentation software using SVG and JavaScript to create animated presentations. Unlike in most presentation applications, a Sozi document is not organised as a slideshow, but rather as a poster where the content of your presentation can be freely laid out. Playing such a presentation consists in a series of translations, zooms and rotations that allow to focus on the elements you want to show.