Open source app to encrypt contents of SD card?

Are there any open source best-in-class solutions for encrypting sd cards?

SD card will be primarily used by Win 8.1 tablet, but would be great if encryption app was cross platform in case I need to e.g. access the SD card from my android phone.
SAbboushiAsked:
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EirmanChief Operations ManagerCommented:
VeraCrypt is the unofficial successor to truecrypt, but it even more secure.
https://veracrypt.codeplex.com/

It part of Codeplex  (supported by Microsoft) for open source software.

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Dave HoweSoftware and Hardware EngineerCommented:
I don't think you can run veracrypt on android though, sadly :D
SAbboushiAuthor Commented:
Thanks for the help
EirmanChief Operations ManagerCommented:
I don't think you can run veracrypt on android though, sadly :D
How about this 3rd party app (mentioned on the veracrypt website)

http://sovworks.com/eds/
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Windows 8

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