The Pirates have non-tendered Josh Fogg. Unless there was a trade offer on the table, which I'm sure there wasn't, this is the right move. Keeping Humberto Cota is, I think, I minor mistake, but he'll be cheap, so it's not one worth worrying about.
The rest of the non-tender list is uninspiring. There are a few pitchers who were interesting in the past - specifically, Wade Miller, Grant Balfour and Kurt Ainsworth - but all have pretty serious injury issues.