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Well all that is left(for now anyway) is:
Avernum: Escape from the Pit
Nethergate Resurrection
Avadon: The Black Fortress

well unless you count the games that are not really modern os compatible such as the orginal Exile trilogy plus Blades of Exile and the original version of Nethergate.

But I don't think we will see Avernum: EFTP since we already have the originals so GOG may think it silly to sell both the original Avernum 1 in a "Complete pack" and then sell the remake separately and I don't have much hope for Nethergate Resurrection either since it's 4.99 on Steam and the lowest price point GOG has so far is 5.99, unless they actually are crazy enough to sell it for that much..