QSSTV 9.1.x has the following new features compared to QSSTV 8.2.x

Build on top QT 5.x ( and also compatible with Qt 4.8)
Better synchronization in SSTV mode
New SSTV narrow band modes (MP73-N,MP110-N,MP140-N,MC110-N,MC140-N,MC180-N)
Changed GUI layout
Gallery window now shows all the rx/tx images.
RX and TX images for SSTV and DRM now in separate gallery tab.
TX Stock Images for fast selecting preferred TX Images.
SSTV Images only saved after a configurable percentage completed
Setting and reading frequency via CAT interface
Preferred fast frequency selection for SSTV and DRM
Editor/templates: multi-line inputs for x,y and z
Pulse audio direct interface