I believe there were more cuts made, but these are the only names I have thus far. (Click on each player's name for their Baseball Reference page)
Vessella, Fitzgerald, Valdez, and Maday were all members a Richmond Flying Squirrels pitching staff that struggled to a second-to-last place finish in the Eastern League in ERA and last place in WHIP. Fitzgerald, a Santa Rosa, Calif. native, had a solid season with Richmond before a call-up to Fresno where he posted a 5.61 ERA in 77 innings.
Bobby Haney was a 2010 draft pick who had finished his second full season with San Jose in 2013, compiling a .257/.326/.338 line in 102 games playing the middle infield.
Stephen Harrold pitched in the "Dog Pound" last season, and like Haney, had played his second full season with the Giants at Municipal Stadium, with an ERA above four both years.