The future deblender for the LSST stack, scarlet, is a 3rd party package developed in a collaborative effort with WFIRST and (soon to be) wrapped into the LSST stack. While still under development, LSST project members and external scientists may be interested in the newly released docs that contain both a quick start guide and more detailed user documentation to get started using the new package.
For a more detailed description of the algorithms used in scarlet the reader is referred to Moolekamp and Melchior 2018 and Melchior et al. 2018.