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• Free & online structural analysis for PC, Linux, Mac, Android, iOS
  Also on Facebook or on Youtube
• Free and online solver for a system of linear equations for PC, Linux, Mac, Android, iOS
• Free and online multiple regression calculator for PC, Linux, Mac, Android, iOS
• Differential equations: lecture notes
• Surveying course: lecture notes
• Steel design: lecture notes
• IQ test: the instant IQ test
• Ansys: fragments of lecture notes for finite element analysis