Open Source Software for macOS
SeaMonkey
The SeaMonkey project is a community effort to develop the SeaMonkey Internet Application Suite and the SeaMonkey web browser. The SeaMoney suite includes a web-browser, advanced e-mail, newsgroup and feed client, IRC chat, and HTML editing made simple.
pyLoad
pyLoad is a free and open-source lightweight download manager written in Python. pyLoad was designed and developed to run on NAS, next-gen routers and headless home servers or whatever device that is able to connect to internet and supporting the Python programming language. pyLoad is extremely lightweight, easily extensible and fully manageable via the web.
Internxt Drive
Internxt Drive is a secure file storage solution with a focus on user-friendliness and security. Internxt Drive allows you to store files, photos, videos in the cloud and sync or backup local files and make them available for sharing online. With Internxt Drive military-grade encryption you can rest assured that your files are in safe and only accessible by you.
Beekeeper Studio
Beekeeper Studio is a well-designed and easy to use SQL client for MySQL, PostgreSQL, SQLite, SQL Server, and a variety of other relational database management systems. The software allows you to connect to databases normally or encrypted with SSL, or tunnel through SSH to ensure maximum security while still providing choices. With Beekeeper Studio, you can manage multiple tabs and multitask across operations, while providing auto-complete suggestions for tables and queries. Commonly used queries can be saved and orginized into workspaces, that can be used across connections and projects. Beekeeper Studio is both free and open source and released under the MIT License.
Syncthing
Syncthing is a free and open-source continuous file synchronisation software that utilise peer-to-peer technology. The software allows users to send files between two or more computers in real time, safely protected from prying eyes. Syncthing is available for Windows, Mac, Linux, Android, Solaris, and BSD.
GNUnet
Help build the internet of tomorrow with GNUnet. It's a software framework for fully decentralized, peer-to-peer networking that offers link encryption, peer discovery, resource allocation, and secure communication. The goal of the project is to replace the old insecure Internet protocol stack. GNUnet includes a fully decentralized DNS (Domain Name System) that utilize a directed graph instead of the hierarchical system implemented today. It also has it's own identity system re:claimID, a decentralized Identity Platform that is baked into GNUnet.
Buttercup
Buttercup is a free and open-source password manager, available on all major platforms. With Buttercup you can track and store your login information for any service and device that you use. The application's securely encrypted vault allow you to store account information securely with additional support for 2FA/OTP (TOTP).
Crystal
A free and open general-purpose, object-oriented programming language developed by Ary Borenszweig, Juan Wajnerman, Brian Cardiff and a community with over 300 contributors. Crystal is statically type checked, which means that all code errors will be caught at compile time, rather than fail on runtime. Crystal provides an easy-to-learn syntax similar to Ruby, while at the same time producing performance similar to that of the programming language C.
Standard Notes
Standard Notes is a safe place for your notes, thoughts, and life's work. With Standard Notes you can create, edit and manage notes with a complete encrypted app that is free and open source.