HoneyWorks is a group consisting of the composer and utaite FernandoP (Gom), and the guitarist ChorisP (Shito☆Raji) and the illustrator Yamako.
Aside from doing VOCALOID original songs, they also release compilation albums of utaite covering their songs.
For a full list of collaboration albums in a sortable table, please see here.
For more information on HoneyWorks as a producer group, please visit their article here on the VOCALOID wiki.