Well, I doubt all of them are abandon yet... Maybe just The Journeyman Project: Turbo?
They made several revisions of the first installment.. The Journeyman Project, The Journeyman Project: turbo, and The Journeyman Project: Pegasus Prime.
There is also two sequels.. The Journeyman Project: Buried in Time, and The Journeyman Project: Legacy of Time.
These are awesome games! They are first person adventure games, like myst, except you have a little sidekick, named Authur, that is in your inventory to give u info or clues if needed. I'm sure some of u remember these games!
k: