Although the new is old do not know if it was mentioned in this forum.
Developers Salome-Platform are working on their version of scketcher (Part Design) called SHAPER. Although recently will be released to the public in 2018 seems to have good progress.
In the SALOME User Day 2015 (November 2015) they presented some slides on this topic:
http://files.salome-platform.org/Salome ... r_Marc.pdf
Sorry for my Bad English