CodeKit
Node.js
Ruby on Rails
ImageOptim
Django
Laravel
Meteor
ASP.NET
yEd
draw.io
LucidChart
OmniGraffle
PlantUML
Dia
UMLGraph
Gliffy
Node.js - Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications
draw.io - Online diagramming application
Ruby on Rails - Ruby on Rails is an open source full-stack web application framework for the Ruby programming...
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.
ImageOptim - Faster web pages and apps.
OmniGraffle - OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.