"We are pleased to offer you the long awaited new stable version of LuxRender: version 1.0. This release features lots of enhancements and fixes all around that have been quickly summarized in the wiki. We give a slightly more verbose list below.
Many thanks to all the developers involved in this development cycle, this is probably the most stable release of LuxRender even if a few issues remain and should be fixed in a forthcoming release. Starting from now on, we'll try to make more timely releases to provide you with improved features as soon as they are stable enough."
Looks to me as this free render app is top notch and does just as well as Arion and a little better then Octane as it has s.s.s. though might be a little slower then Octane.
Did I mention Free and w/si exporter