BabaCAD is a free CAD application with DWG and LISP. It is designed to easy for students and powerful enough for professionals.
BabaCad has a lot of features, too many to list here but to give you an idea; it supports standard CAD files (*.DWG, *.DXF), fast edit and save your work with high precision, organize and group objects with layers and blocks, draw and modify 2D vector objects like point, line, rectangle, polyline with arc segments, circle, arc, hatch with patterns, text, block, dimension, image, fast access to blocks using Block Explorer palette, smart quick dimensioning with linear, aligned, radius, diameter and angular dimensions, automate and speed up your work with LISP programming extensions with the first customizable and LISP enable freeware CAD, and create your own LISP command icons and load .lsp files on startup.
If you get stuck or need additional features, BabaCad offers help pages, extension modules, support forums, and tutorials.
BabaCad is fairly small so our download has both the 32-bit and 64-bit versions included.