TINA is described as «Design Suite is a powerful circuit simulation package for analyzing, designing, and real time testing of analog, digital, VHDL, MCU, SMPS, RF, communication, optoelectronic and mixed electronic circuits and their PCB layouts» and is a circuit simulator in the education & reference category. There are more than 25 alternatives to TINA for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and iPhone. The best alternative is KiCad, which is both free and Open Source. Other great apps like TINA are Circuit JS, Fritzing, QUCS and LibrePCB.TINA alternatives are mainly Circuit Simulators but may also be Electronic Design Automation Tools or CAD Software. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of TINA.