HardwareX 

TL;DR: This work presents and discusses the hardware IoT infrastructure substrate that provides real-time monitoring in multiple school buildings, and believes that such a system needs to follow an open design approach: rely on hardware-agnostic components that communicate over well-defined open interfaces.

TL;DR: A syringe pump large volume extruder (LVE) that is compatible with low-cost, open source 3D printers, and compatible with open source hardware and software is designed, and its performance is demonstrated on a PrintrBot Simple Metal.

TL;DR: The hardware build of a low-cost, small, full-spectrum alternative to ruggedized, but expensive acoustic monitoring equipment, called AudioMoth, is described, which facilitates deployments in remote locations and long-term monitoring.

TL;DR: The RepRapable Recyclebot as discussed by the authors is a waste plastic extruder capable of making commercial quality 3-D printing filament, which takes advantage of both the open source hardware methodology and the paradigm developed by the open-source self-replicating rapid prototyper (RepRap) 3D printer community.

TL;DR: This study evaluates free and open source technologies in the two repositories compared to proprietary functionally-equivalent tools as a function of their use of Arduino-based electronics, RepRap-class 3-D printing, as well as the combination of the two to provide strong evidence for financial support of open source hardware and software development for the sciences.