Webcamoid - Webcamoid is a full featured webcam capture application.
Element.io - Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Kamoso - Kamoso is a webcam recorder from KDE community.
ChatSecure - ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.
Cameroid - Just like Photo Booth - exept is online. Have fun with your webcam. Apply text and funny effects.
Otr.to - A secure peer-to-peer chat in your web browser.