It is not too late to send Christmas cards through the mail, but free and online sounds pretty good as well. An option to consider is sending a free digital card to your friends’ and family’s email. Here are a few places where you can send free online Christmas ecards:
http://www.fotor.com/creatives/photo-cards/christmas-cards –With Fotor you can make and send beautiful digital photo cards!! They are free, but you will have to create a user name and password.
http://www.jibjab.com/holidays –The always fun Jib Jab card allows you to crop a few faces and insert them into your holiday card that is sure to get a few laughs.
http://www.punchbowl.com/ecards/christmas –A more traditional Christmas card can be found here. Most are free, and you can even purchase a gift card to major stores and restaurants to be included in the digital card.