In reply to rubisco:
Done this several times with my family, hopefully again this year!
Parte itself from the South requires no crampons at all. You can actually hike more than 10 km of the ridge line that you see once you turn off Kungsleden towards the hills. The approach over the glacier from the East is full alpine glacier tour, that I would only consider roped up in a team, etc..
The other summits in Parte massiv a bit further north look impressive from Luohttolahko, but not all can be climbed easily from that side (e.g. Saitaris!). Lullihatjahkka from the lake below is doable, again no crampons needed.
Skarkki is a plateau mountain that can be accessed from the Rapadalen side, or even better from the Jilavagge, a side valley of the pass at the end of Snavvavagge (the usual shortcut to Skarja coming from Rapadalen). At least its summits overlooking Rapadalen are ice free scrambles from that side.
Sarektjahkka main summit (Stortoppen) again is a full on glacier climb from the south via Mihkkajiegna, while the North summit is glacier free from the North. The ridge between the two is proper alpine climbing, I have not done it as I never carried enough gear and especially not a rope able to hold a leader fall.
It is possible though to do a long ridge traverse from (I think) Gavabakte to Nijak without dropping down into Ruohtesvagge that has minimal glacier contact.
Ahkka main summit is proper glacier climbing from the north but only a long scree scramble from the Southeast (between the two narow glaciers) with a little exposed scrambling near the top.
My favourite area for climbing is the Alkatj massive in the centre. Lots of summits available from Sarvesvagge or Tielmabuollda or Alggavagge in the North. Again, the East side is proper glacier climbing.
If you can read either Swedish or German you should get the Sarek guidebook by Claes Grundsteen, no other guide comes close. It has excellent suggestions for climbs, info about the glacier crossings, etc., even if you ignore the suggested treks. The difficulty of the climbs is also somewhat overstated, as it is not an actual climbing guide.
My tip for Kvikjokk --> Ritsem is to go left around Parte, either across Luohttotjahkka and down into Sarvesvagge (the best valley of all!) or a bit further left through Njoatsosvagge. Best to avoid the idiot trap of the bridge across Gadoktjahkka, together with Aktse and Skarja one of the few places in Sarek where the hordes congregate (relatively speaking...)
CB