This is a good logo.
The colours are good. Bold and correct for their original logos.
The borders are mismatched, so the foss logo border is wider. They'd look better if they were the same.
Some of the curves in the S's look a bit square. This could be that the original logos have these faults and the borders bring them to the fore.
The border lines in the S's are also too close together. A border on the outside of the shape would be better, but widening the corves a little in key places would work well.
The line miter where the two S's join isn't as sharp as it needs to be. It should be increased and adjusted so it rests at a point in that join.
Over all it's well composed. The O fits well in the gap and the overlap on the O and first S is good.