Osketch is described as 'vector graphic design tool. It's lightweight, easy to use, and powerful. Osketch has many modern features. In Osketch, you can use any graphic as a mask, fill a shape with multiple modes, layout texts on a path'. There are more than 10 alternatives to Osketch for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and PortableApps.com. The best alternative is diagrams.net, which is both free and Open Source. Other great apps like Osketch are yEd Graph Editor (Free), LibreOffice - Draw (Free, Open Source), Dia (Free, Open Source) and Microsoft Office Visio (Paid).
diagrams.net (previously draw.io) is a free online diagram drawing application for workflow, BPM, org charts, UML, ER, network diagrams. No login or registration are required and features include the ability to save locally (including SVG), a range of stencils, .
Draw lets you produce anything from a quick sketch to a complex plan, and gives you the means to communicate with graphics and diagrams. With a maximum page size of 300cm by 300cm, Draw is a an excellent package for producing technical drawings, general posters, and much else.
Microsoft Office Visio makes it easy for IT and business professionals to visualize, explore, and communicate complex information. Go from complicated text and tables that are hard to understand to Visio diagrams that communicate information at a glance.
Draw, part of the Apache OpenOffice suite, is a graphics editor that gives you the tools to communicate with visuals and diagrams. With a maximum page size of 300cm by 300cm, Draw is powerful tool for posters, graphs, charts, and more.
Instead of starting with a blank screen, SmartDraw gives you the exact template you need. Then use simple commands to add your information and SmartDraw does the rest. There's no other drawing software like it.