GovTrack.us - GovTrack.us enables users to track the bills and members of the United States Congress.
draw.io - Online diagramming application
ISideWith - See which American political parties, candidates, and ballot initiatives match your beliefs based on the 2019 issues that are most important to you.
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.
Vote Smart - Vote Smart, formerly called Project Vote Smart, is a non-profit, non-partisan research organization...
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.