OpenOffice Draw software implements opensource philosophy, all documents import / export are stable and clear, meet open document standards, cross-platform, compatibility.
Everything an ordinary and advanced user a needs for making visualizations inside or outside documents staying in OpenOffice suite environment. I have not used this feature a lot but OpenOffice Draw has objects manipulation functionality to rotate in two or three dimensions; the 3D controller allows you to create spheres, rings, cubes, etc. in a quick pinch. Built-in and pluggable (extensions) image galleries. Works with common image formats (import/export), able to create and edit flash files. GUI can be customized by OpenOffice and icon themes. It is free, open-source software package, cross-platform and very compatible.
Different wizards with templates for document formats. Built-in Pdf export, the same as other OpenOffice packages. A long list of functions: document templates, frames, mail merge, a style manager, section-based headers and footers, and much more.
I do not find feature to dislike in OpenOffice, except high memory consumption with certain configuration. I needed to search the internet for making it faster with some performance and optimization fine-tuning. Many sites and tutorials advice to migrate to LibreOffice and/or choose other alternatives for office software.
A best free alternative for Microsoft Office similar products, following Open Document Format for Office Applications (OpenDocument) standards. Free,useful and intuitive.
Using primitives i can draw / create beautiful imagery for different purposes ( diagrams, chart, embed photos, etc.).