  Since 2009, the Kepler, K2, and TESS missions have produced a vast number of
lightcurves for public use. To assist citizen scientists in processing those
lightcurves, the LcTools software system was developed. The system provides a
set of tools to efficiently search for signals of interest in large sets of
lightcurves using automated and manual (visual) techniques. At the heart of the
system is a multipurpose lightcurve viewer and signal processor with advanced
navigation and display capabilities to facilitate the search for signals. Other
applications in the system are available for building lightcurve files in bulk,
finding periodic signals automatically, and generating signal reports. This
paper describes each application in the system and the methods by which the
software can be used to detect and record signals. The software is free and can
be obtained from the lead author by request.
