Screenshots:ecadlite :

Levels\Layers:
In eCADLite you can use both numbered levels and/or layer names.
You can also drag and drop layers into groups and sub-groups!

Reference Files:
eCADLite can simultaneously attach Reference Files from MicroStation,
AutoCAD (DWG and DXF), Raster files and Bitmaps!

Printing and Plotting:
Printing in eCADLite is designed to be as simple as printing in Excel.
Automated title block functionality is also offered.

Cells\Symbols\Blocks:
eCADLite allows you to open a whole cell library and make edits,
without the complex process of exploding and recreating cells.

Redlining\Annotations:
eCADLite offers powerful redlining functionality with unlimited redline layers and comments.