87d1af5b13
.. support for axes that are time based, assuming the user has supplied in seconds starting from 0 (which is true for an activity). .. since QT charts requires times to be in MS since Epoch and we don't know if we need to convert from seconds until the axis is configured the series data is updated just before charts are created in GenericChart. This means that anyone using generic plot directly will need to do this conversion. For this reason all integration across the GC codebase should be via GenericChart. R, Python and now User charts integrate via Generic Chart so this should not really be an issue.
GoldenCheetah
About
GoldenCheetah is an open-source data analysis tool primarily written in C++ with Qt for cyclists and triathletes with support for training as well.
GoldenCheetah can connect with indoor trainers and cycling equipment such as cycling computers and power meters to import data.
In addition, GoldenCheetah can connect to cloud services.
It can then manipulate and view the data, as well as analyze it.
Installing
Golden Cheetah install and build instructions are documented for each platform;
INSTALL-WIN32 For building on Microsoft Windows
INSTALL-LINUX For building on Linux
INSTALL-MAC For building on Apple OS X
OSX: 
Windows:
Alternatively, official builds are available from http://www.goldencheetah.org
whilst the latest developer builds are available from https://github.com/GoldenCheetah/GoldenCheetah/releases