For the datasheet please visit the product page https://www.sciosense.com/products/environmental-sensors/ccs811-gas-sensor-solution/
Evaluation Software: ENSDashboard is a Windows application that supports monitoring and logging of sensor measurements. It can be downloaded here https://github.com/sciosense/ENSdashboard
This software is intended to evaluate all functions of the desired product using the evaluation kit for CCS801, see https://www.sciosense.com/products/environmental-sensors/evaluation-kit-for-ccs811/
C++ drivers for the sensor can be found here https://github.com/sciosense/CCS811_driver