Inkscape
Create SVG graphs
Mathematica Slide Show
Mathematica can be used to create interative slides.
Beamer
slides.com
Make dynamical slides with synchronous presentations over all devices.
Amphetamine App
Amphetamine keeps your Mac awake during presentations.
Gliffy
Diagram software that works as hard as your team.
Processon
Online Mindmap, FlowChart, MindMap, UI, UML and Network charts with Collabration in Real-time.
Plectica
Plectica is helps us managing our mind. It is more flexible than mindmaps.
Overleaf/Overleaf
Overleaf and ShareLaTeX are Online LaTeX editors with collaborations, history, chat, and submission.
Papeeria
Online LaTeX editor
Authorea
Write and submit your papers online.
HackMD
Online markdown editor with collaborations and sharing built-in.