Folkeuniversitetet ("people's university"; previously Friundervisningen - free education/free learning)
and folkehøyskoler ("folk/people's high schools") in Norway.
I got my first exposure in computing in part because my dad agreed to teach computers for Folkeuniversitetet/Friundervisningen in the early 80's, but he needed to borrow one to learn to use it first...
In Norway it sprung out of students in the 1860's who wanted to make education more broadly available (Henrik Ibsen was one of the founding students, as was Bjørnstjerne Bjørson, perhaps less known outside Norway but the first Norwegian Nobel laureate in literature)
In Finland there are "kansanopisto" that are a little like the Swedish ones described in the article but with less resources. I spent my final year of upper secondary school at one of them (https://www.paivola.fi) which hosts a math enrichment programme, but that one is quite unique.
That particular institute got started in the late 1800s to educate farmers with an ideology similar to the Swedish system of the article, but by the 1990s it had mostly language courses. (Didn't get into university? Come study Spanish for a gap year, we'll make a trip to Spain at the end.) Currently in addition to the math programme they seem to teach several subjects with a kind of unofficial arrangement with universities. (Didn't make it to law school/psychology/teacher school? Come study exactly that for a year to improve your chances in the next admissions round, with some credit probably accepted toward your eventual university degree.)
In Portugal there are Cultural Associations, which have a certain legal standing with associated formalities. Sometimes they even have premises they run for meetings etc. They tend to be formed according to particular interests, if I understand correctly. Hopefully someone from Portugal can elaborate on this.
There are the chitalishte institution in Bulgaria which are centers for education, culture and furthering national movement in the very beginning. Couldn't find a good source in english.
I got my first exposure in computing in part because my dad agreed to teach computers for Folkeuniversitetet/Friundervisningen in the early 80's, but he needed to borrow one to learn to use it first...
In Norway it sprung out of students in the 1860's who wanted to make education more broadly available (Henrik Ibsen was one of the founding students, as was Bjørnstjerne Bjørson, perhaps less known outside Norway but the first Norwegian Nobel laureate in literature)