Playmobil fits the bill as well. When I was a kid Playmobil and Lego were similarly popular and it was only much later that I learned that Lego is known everywhere but Playmobil is not. Playmobil is not as versatile as Lego but in my experience it is much better suited for outdoor play.
A more hidden champion is Ankersteine. I have one of their construction kits which is in my family probably since around 1885 and these kits are still produced today.
A more hidden champion is Ankersteine. I have one of their construction kits which is in my family probably since around 1885 and these kits are still produced today.