I only asked for the value because the pickup place is far from where I live and I have to know if it will be worth the trip.
And with value (maybe I picked the wrong word) I don't mean just money, but if the games are good in quality and gameplay, if they were important in their time (iconic, popular), etc.
I would never sell something that was given to me, specially on freecycle, because I support their ideas of recycling and reusing and that wouldn't just be something I'd do.
My apologies - I meant my "sell for profit" as a jest (hence the winking smilie), but I guess it was lost in translation to the web! As for the games, that's up to you. The Roberta Williams Anthology is certainly historic, as many of her games are milestones in the computer gaming industry. Mystery House was the first graphical adventure game, King's Quest was the first 3D-animated adventure game. The King's Quest series were not only good, but popular, having been at one time the top-selling game series of all time (and very possibly still are, although it's been years since I've seen someone tracking sales figures of games). Phantasmagoria was a great entry into the horror genre, and was also one of the most successful games using FMV (full motion video). Also, at 7 CDs, it was probably the largest game ever seen at that point in time. The Gabriel Knight series are also great games both individually and as a group...
The 7th Guest is notable as being one of the first games to use FMV (full-motion video), and was one of the largest games ever at its release, so far as the # of CD's. The Gobliins games from Sierra/Coktel Vision are great puzzlers that have a lot of humour in them, and The Dig is a LucasArts game. While it never reach cult status as did the Zak McKrakens, Maniac Mansions, etc, you really can't go wrong with any LucasArts game, honestly.
For me, the only question marks are the Queen game and the Myst game... Myst is supposedly great, but I could never get into it... the first-person, static imagery was a huge turnoff to me, after having been weened on Sierra's and LucasArts's adventure games.
If it were within 100 miles of me, I'd be making the drive, though I would also find something else to do along the way back to make the trip truly worthwhile - maybe find a flea market or a good restaurant or something to stop at and celebrate your good fortune of getting the games for free!