Question title is quite clear, no ?
I found a bunch of "free for personnal use" ramdisk softwares on alternativesto but absolutely no open-source. So, do you know any one ?
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Gavotte RamDisk http://www.techsnack.net/gavotte-ramdisk-free-virtual-hardisk
Uses Physical Address Extension to create a virtual disk in memory that can not be accessed by 32 bit versions of Microsoft Windows (memory above 4GB + remapped PCI hole).
ImDisk Virtual Disk Driver is a disk image emulator created by Olof Lagerkvist. It is Free software/Open source software. It is available in 32 and 64 bit variants and is digitally signed which makes it compatible with 64-bit versions of Microsoft Windows without having to be run in Test mode. The 64-bit version has no practical limit to the size of a creatable RAM disk.
RAM disk plug-in for Bart's PE Builder <- You're probably not interested in that one
Wikipedia is your friend :-)