Usually has great exhibits concerning Stockholm and it's history. They cater for the kids as well, both with information in the exhibits and a nice play area.
Note that it is no longer free as it used to be though. Entrance is 70 SEK (which gives you access for a calendar year).
They have information in English, but not for everything so it might be slightly less interesting for those who don't know Swedish.
They also have a very nice room with photos and other information on specific areas and streets in Stockholm (Faktarummet). Great if you are interested in a particular place in Stockholm. The opening hours for the room are restircted though so check them before you go.
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