Free Software for Linux
Ajenti
Anjeti is an server administration tool and control panel for server management. It provides you with a fast and secure way to manage a remote Linux box at any time using everyday tools like a web terminal, text editor, file manager and others.
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.
Remotely
Remotely is an all-in-one remote access software. With Remotely you can instantly connect to remote desktops either unattended or by invite, where invites are started from a single-file, portable executable that's easy for customers to download and use. Remotely also allow you to do remote scripting so that you can save time on quick fixes and ad-hoc scripting with an interactive console that lets you execute commands against multiple remote machines simultaneously, with instant results. Written with rich auto-complete for PowerShell Core, Windows PowerShell, Windows CMD, and Bash increases speed and accuracy of commands.
ISPConfig
With ISPConfig you can manage your servers directly through your web browser. ISPConfig is an open-source panel for Linux-based servers which is capable of managing multiple servers from one unified control panel.
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.
SparkyLinux
SparkyLinux is fast, lightweight and fully customizable operating system. The open source OS is based on Debian and released as free software under the GNU General Public License. With SparkyLinux, people can enjoy a stable operating system which is released with few different version depending on your use case. The fully featured release, with Openbox as a desktop environment and special editions called GameOver, Multimedia & Rescue.
OpenConnect
OpenConnect is an open-source SSL VPN client for Linux and Windows. OpenConnect is based upon SSL security protocol and was built as a replacement VPN client for Cisco’s AnyConnect SSL VPN. With support from the open source community it has now become the standard underlying technology for many VPN providers. With OpenConnect you can implement your own server, initiate data encryption, and import and manage server configurations.
Libreswan
Libreswan is a popular open-source VPN alternative that supports common protocols such as IKE and IPsec. IPsec is a meticulous protocol suite that mainly works to secure encrypted data that’s being shared between two parties. Whereas, the IKE executes secure authentication and dynamic key generation for seamless data flow. Both these standard suite protocols are created and maintained by the IETF (Internet Engineering Task Force). Libreswan provides a wide range of security features and uses opportunistic encryption techniques. Libreswan is avalible on Linux and uses repository files and tarbal which makes the installation process as simlpe as possible.
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.
Phototonic
Phototonic is a fast and functional, open source image viewer and organizer. The software is written in C++/Qt and released for free under GNU General Public License v3. Phototonic takes inpiration from traditional image views and provides overview of your inventory with thumbnails and organized layouts.