But OS/2 did give us...
...jfs. The linux version of jfs is from OS/2. A pity IBM can't find it in its heart to liberate jfs/2, but jfs is the only linux filesystem with which I have never lost data in 20 years of linux use. (I know xfs isn't the beast it once was, substituting @ signs for real data, but the pain hasn't yet gone away.)