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QElectroTech: Drawing electrical diagrams
QElectroTech is open source software to draw electrical diagrams free of charge. In addition to the software, you will also find a manual, videos and sample diagrams on this website.
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App or softwareTeacher -
ClaroPDF: PDF tool
ClaroPDF is a professional and easy-to-use PDF reader and annotator. Annotate, mark up, and save PDF files that are still fully compatible with Adobe Reader and other popular PDF apps.
Translated by
App or softwareTeacher, ICT co-ordinator