DMcCunney wrote:Which library system is yours part of?
...
The NYPL, and most other library systems, use Overdrive as the eBook source. ...
The Las Vegas and Clark County library system uses Overdrive. The App they have for download to Windows based systems is Adobe Digital Editions 2.0. That's for ePub format. Kindle versions download through Amazon. Or you can use the Overdrive online reader with any browser -- provided you have an Internet connection.
DMcCunney wrote:For non-DRM e-books the eBook Reader in Calibre is more than adequate for any eBook format I've found.
Assuming you are at the machine on which Calibre is installed, it's dandy. If you are on a mobile device, it's not an option.
I primarily use Calibre to reformat to AZW3 and port to my Kindle for non-DRM works. I usually don't have any trouble converting PDFs as long as they're text and not scanned page-images.