trend is a general-purpose, efficient trend graph for "live" data. Data is read in ASCII format from a file or continuously from a FIFO, and is played in real-time into a multi-pass trend (much like a CRT oscilloscope or a strip chart). trend can be used as a rapid analysis tool for progressive or time-based data series together with trivial scripting.
HantekDSO is USB oscilloscope software for Hantek/Voltcraft/Darkwire/Protek/Acetech/etc. DSO-2090/2150/2250/5200A/etc. oscilloscopes. It is based on the libusb and Qt/OpenGL libraries. The project includes a firmware extraction utility and udev rules file for loading firmware under Linux/Unix.
SynScope is an offline visualization and alignment tool for time-varying signals acquired from multiple sources that may differ in offset and/or sample rate. SynScope allows you to define reference points that correspond to identical events between source pairs. It then estimates the offset and resample rate to link these sources. It maps sample time from one source to the other via a link equation. Signal alignment can be inspected with synchronous visualization or resampling. With synchronous visualization, linked signals scroll together according to the link relation. With resampling, linked signals are resampled to the highest sample rate and offset-compensated.
comedirecord is an oscilloscope program to record data from a COMEDI-compatible device. Its philosophy is to save the data in its original unfiltered form but allow comfortable viewing of the data during an experiment. One can acquire data from multiple DAQ boards simultaneously, and also append data via an incoming TCP port, which could be a telnet connection into comedirecord or data from another program. Low-pass, high-pass, and notch filters can be switched on for each channel. A DC filter can be switched on, which is useful when observing small voltage changes at a high gain (for example, measuring small temperature changes). The output format is ASCII so that the data can be imported into GNUPLOT, scilab, or octave.
AudioScope is a text mode audio oscilloscope that captures sounds using DEMO, SOX, or DSP (/dev/dsp}. It is primarily a learning tool for kids. The script includes code and circuit diagrams for calibrating the horizontal and vertical axes. It features a demo mode with no dependences that samples /dev/urandom.