Back in the 80íes I used a b+tree package to use with PLi86 on MsDos. My memory says it was from Greenleaf. Unfortunately they do not exist anymore and the owner has passed away.
Anyone have experience with a good B+tree package which can be linked with link86?
If my memory is correct then I think it was from SoftC which was sold by Greenleaf. Unfortunately there a some libraries but I was hoping to find the sources. Anybody have any idea?
I read an article about the SoftC database library 3.0… now the sources 
There was BTrieve too.