draw.io - Online diagramming application
tado Smart AC Control - Control any AC from anywhere with your phone
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
LOOFT- A/C Redefined - Comfort Automated
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Mistbox - Save 30% on your air conditioning bill