Wickr - Wickr is a free end-to-end encrypted text, video, picture and voice messenger with full sender...
Scrubhouse - Drop-in audio chat for the rest of us
Burn Note - Burn Note is the name of a continuous private messaging utilizing which you can have an ongoing private discussion with your companions or any individual who is at Burn Note.
Walkie - Walkie is an online communication providing software that allows you to remain in touch with the other persons.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Rodeo - A Native Python IDE for Data Science