Sweden - I'd rather say it produced a relativey large number of weapons of all kinds. The Bofors 40 mm gun was one of the most popular anti-aircraft systems during the period, used by the allies and the axis.
Yeah, but the overwhelming majority of these was built on license - not in Sweden.
Aircraft produced by SAAB and FFVS was not inferior to those produced by the majors.
They were slower, and less well armed than the leading aircraft made in the same year by the UK, Germany, and USSR in every case - pick any of them
Sweden produced the first prototype of an ejection seat late in the ar.
And?
In the 1950s, Sweden arguably had more advanced aircraft than the US/USSR - look up the SAAB Tunnan and Lansen.
Even if true, this would be irrelevant.
Landsverk also made a number fully modern tanks for they time, for example the Stridsvagn m/42.
In small numbers, and it was actually out of date compared to Allied, Soviet, and German tanks of the same year (1943 - the Churchill, the T34, the Tiger).
Switzerland - The Oerlikon 20 mm cannon was widely exported and used by the allied and axis nations.
Irrelevant - these were built on license.
Aircraft were produced by several manufacturers, among them Eidgenössisches Flugzeugwerk in which produced aircraft up to par with the majors.
Which was why the Swiss used German aircraft instead? Remember: we're talking about countries that could arm themselves.
Belgium - Renard and SABCA produced aircraft that could at least be classified as decent.
So decent they scored hundreds of victories over the Germans - right? Oh, well then.
Poland - Had a large native tank and aircraft industry that churned out decent quality.
Tanks and aircraft that were mostly obsolete in 1939. Again, I'm not seeing where the "decent" part comes in.
The quality of the materiel produced in the 1930s was not the main problem to the Polish army.
On top of everything else, the poor quality and quantity of Polish tanks and aircraft did not help.
The Netherlands - Fokker dominated the civilian aviation market in the 1930s and produced a number of high quality aircraft that was exported all over the world.
Civilian aircraft are not the topic under discussion. Did the Netherlands field a decent army from their own industrial base?
Czechoslovakia - As has been said, it is widely recognized that Czech arms industry did produce as good or better arms than that of the majors of the era.
They produced small numbers of some tanks which the Germans found useful. And that's about it.
Then you had Avia which produced aircraft not any less modern than that of the majors.
This is impossible to say since they never went into action.
Hungary - MAVAG and Manfred Weiss produced a large number aircraft.
They produced German aircraft under license, overwhelmingly for export to Germany and under German supervision.
Hungarian produced Turan and Toldi tanks were decent.
The wartime total for all Hungarian armoured vehicle production is
around 500. That's enough to equip a single armoured division with almost no replacements. The Turan I tanks which made up the lion's share of these were armed with a 40mm gun and debuted in 1941 - I need hardly point out that it did not fair well against any of the tanks it was put up against.
The world's first turboprop, the Jendrassik Cs-1, was designed and produced in Hungary in 1938. Hungary also produced some quite advanced rocket anti air and anti-tank weapons at the end of the war.
Since they did not field large numbers of any of these enough to equip their armed forces to a decent standard this is irrelevant.
Frankly, I think you're going to have a hard showing any minor that demonstrably built a "decent" army (let alone airforce or navy) using its own industrial base. The only minors outside the British Commonwealth to do much more than rapidly capitulate under German/Japanese/Soviet/British/US attack during the war were Finland and China, who are well-known to have relied mainly on imports for heavy weapons.