I've searched and didn't find any thread for this, seeing as many of the brands are too small to justify their own threads.
Hoping this thread can serve as a reference for anyone searching for info about these brands. I will try to expand it as I have time and if I find more info.
Sweden:
- Bahco
- E.A. Berg
- F.E. Lindström
- Sandvik
- Tors Hammare
- C.I Fall
- Orenco
- Ray
- O'kay
- Borgis
- Eminent
- Momento
- Öbergs
- Hultafors
- C.E.J
- Vigor Verktyg AB
- BKT
- KaBe
- H. Kling
- Talmeter
- Jernbolaget
- Kapman
- Svalling
- G-Man
Lots of large knife and axe manufacturers missing from this list...
Norway:
- Kongsberg
- Geilo Verktøy AS
- ØYO
Denmark:
- Botalit
- Dansk Staal Industri (DSI)
- Viking
- Jack
Finland:
Bahco
No need to say much here, since it's easy to find info. Started with pipe wrenches, but made famous for adjustable wrenches. Still around today and owned by Snap-On.
The name is short for Berndt August Hjorth & Co.

Several generations of 8" Bahco adjustable wrenches, from the first generation to the latest and some special versions.

Some Bahco items, from the 50s to the 90s.

Bahco pliers with embossed logo on the handles.
E.A. Berg
Famous for pliers, knives and woodworking tools. Founded in 1880 in the town Eskilstuna. It was bought by Bahco in 1959. Bahco used the brand name until 1965 for pliers, perhaps longer for chisels.

Logo variations

My favourite E.A Berg pliers, the "frog leg" linesman's pliers.
F.E. Lindström
Pliers manufacturer, now owned by Bahco. Founded in 1856 in Eskilstuna also, and bought by Bahco in 1974. The brand name Lindstrom is still used for their lines of precision pliers.

Logo variations
Sandvik
Steel specialist that has produced tools during the years, mainly famous for saws when it comes to regular tools. Owned Bahco for a while, and it's not unusual to see tools branded "Sandvik Bahco" and also "Sandvik Belzer", from the German tool manufacturer Belzer that they also owned.
Tors Hammare
Name translated to "Thor's Hammer", a hammer specialist manufacturer from Eskilstuna. Bought by Hultafors in 1992, and somewhere around 2004 the Swedish production closed.

Logo variations. The top one is the newest and last one used.
C.I Fall
Manufacturer of woodworking tools since 1894, still around in Eskilstuna. They used to make really nice screwdrivers also.
Öberg & Co (C O Öberg & Co)
Specialised in files and located in Eskilstuna. Founded in 1848, bought by Sandvik in 1975 and later transferred to the Bahco brand by them. Still used as a brand name, but production moved from Eskilstuna in 1992.
Orenco (Orencoverken)
Smaller Eskilstuna based manufacturer of wrenches other forged items. I don't have much info, they were founded in 1951 and were still around in 1971.
Ray
Seems to be a brand name used by Orenco.
O'kay
Manufacturer or just a brand name? I don't know. Looking for more info!
Borgis (Bertil Borgenstierna & Co AB)
Founded in 1909 and was still around in 1947, no more dates known. Located in Vagnhärad.
Jernbolaget (Eskilstuna Jernmanufaktur AB)
Manufacturer of a range of steel and iron items from 1868 until 1966. Wood chisels and knives are the things that classify as tools, but you can find many household items with their crown and anchor logo.
Eminent (Eminentverktyg)
Founded in 1933 and was still around in 1947. Made all kinds of tools and household items. Made adjustable wrenches with very similar patterns to Bahco (license or copies?).
Momento
Specialist manufacturer of sockets that's founded in 1951 still around today still in the town Flen.
KaBe Industrier AB
Specialised in plastics, found on screwdrivers and wood chisels. Founded in 1947 and was still around in 1971. Located in Enköping.
Vigor Verktyg AB
Pliers specialist founded in 1934 in Eskilstuna. Was still around in 1971.
BKT
Found on pliers, I have no info about them.
H. Kling
Henning Kling Smidesfabrik Torshälla. Founded around the 1880, was still around in 1947.
Talmeter
In 1954 Ture Anders Ljungberg put the Talmeter on the market, which he had designed after being dissatisfied with existing measuring tools. The company grew from his garage to a successful company that was bought by Hultafors on 2005. Hultafors still makes the Talmeter in a new design. All the different colors available has made them popular by collectors and they can fetch high prices for the unusual versions.

Different version and one of Hultafors current ones.
Svalling
The name is famous for swords and knives, but can also be found on shears and scissors.
There is lots of first names that can be found, like Emanuel, Olof Fredrik, Frans Oskar and many more versions.
Hultafors
Hultafors is still around and has turned into a tool making giant. Knives, measuring tools and more. Founded in 1883 around their folding rule design, which is still very common in Sweden.
Kongsberg
I only know them as making pipe wrenches and adjustable wrenches after Bahco patterns, but they had some of their own patterns also. Someone from Norway that can give more info?
Geilo Verktøy AS
Manufacturer of screwdrivers with red handles that seems to have disappeared quite recently. Someone from Norway that can give more info?
Botalit
Not sure if this is a manufacturer or a brand name. Danish made screwdrivers with yellow acetate handles. Someone from Denmark that has more info?
Dansk Staal Industri
Danish Steel Industry, seems to still be around. Hammers and axes it seems mostly. No more info yet.
Billnäs Bruk
Finnish forge that made adjustable wrenches after Bahco patterns on license. Also famous for axes and knives. The forge has a history dating back to 1641, but the company was bought by Fiskars and the forge closed in 1983.
https://www.traditional-tools.com/billnas-bruks-ab-history/
Fiskars
Still around and thriving, huge in garden tools.