Doug's NewsReader - Open Source Software for Windows. Scores authors from idiots to experts, and sorts threads accordingly. Source code available. Multiple server support, sorting options, upload binary attachments of any size. Both offer off-line reading and handle binary attachments.
Agent offers advanced filtering options and integrated e-mail support.
The Pro version is not limited to 500 pictures. Automatically searches news groups and downloads pictures and other binary files. Mass Splice - Free file splicer. Combines multi-part files downloaded from a news group back into one file. MicroPlanet - Gravity is a shareware newsreader for Windows.