Bib Me - quickly generates citations in APA, MLA, Chicago, Harvard and thousands of other styles for your bibliography.
Citation Machine - helps students and professionals properly credit the information that they use.
Easy Bib - Automatic works cited formatting for MLA, APA and Chicago/Turabian citation styles.
(Found in the Chrome Store)
Apogee - Creates comprehensive citations from websites
Cite This For Me - Easily sites your websites from the task bar