Zotero for Alumni
Zotero is a free, open-source citation tool that continues to be available to students after graduation.
Before your HKS email account becomes inactive you should add a personal email address to your Zotero account. Do this by going to the Zotero login page and going to Settings and then Account. Scroll down to Add Email and add in a personal account. Click on Update Emails to save.
All content added to Zotero before graduation will remain in your account but any new content will be subject to Zotero's free 300MB limit once your HKS email becomes inactive. You can pay for more storage through your online account.