Is there an open source alternative to "Adobe Digital Editions"?

.acsm can only be used with Adobe Digital Editions and stands for Adobe Content Server Manager.

For more information about Adobe Digital Editions please see http://www.adobe.com/products/digitaleditions/faq/

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_{Side note (may not be generally applicable to Digital Editions users): Stated in the agreement (may be of concern in making a program to access .acsm ) for Adobe Content Server section 11.1 you agree not to:}

_{(d) obtain or attempt to obtain any materials or Information through any means not intentionally made available through the Services;}

_{Interpret this as you will, I will not give you legal advice.}

You can also use OverDrive which is a fairly reasonable ebook reader. You need to put in your Adobe ID to register it, and after that, it will open .acsm files and download the relevant ePub for you.