DMM-1538 allows you to connect a DMM 1538 digital multi-metre to you Mac using a serial port and view readings.
MacSpice is an implementation for the Apple Macintosh of the Berkeley Spice 3f5 electronic circuit simulator. However, MacSpice is not simply a 'port' of the Berkeley code, it incorporates many improvements ranging from simple bug-fixes to entirely new algorithms and solution strategies.
MacTXLine calculates parameters for transmission lines in electromagnetic systems. It support 3 different lines: Microstrip, Striplines and Coaxial lines.
Qucs is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit. After that simulation has finished you can view the simulation results on a presentation page or window. Read more
Spice is a straightforward, mechanical port of the Spice electronic circuit simulation program to the Macintosh (MacOS Classic and MacOS X - the port is carbonised).
VC 840 Recorder
VC 840 Recorder can receive and record data from the digital multimeters sold under the name "Voltcraft VC 820" and "VC 840" by Conrad in Europe, and possibly others manufactured by Uni-Trend.
vPICdisasm is a Microchip PIC Mid-Range family firmware disassembler. It can disassemble all 35 PIC instructions, plus the two deprecated ones as defined by the PICmicro Mid-Range MCU Family Instruction Set, document DS31029A. This single-pass disassembler can handle Intel HEX8 and Motorola S-Record formatted files containing valid PIC firmware. It supports a variety of formatting features, including representing data constants in different bases, and displaying the ASCII equivalent in an assembly comment. vPICdisasm can output directly to assemble-able code.