RSA CRT/SFM Converter
This tool enables you to convert an RSA private key from an SFM format (Straightforward Method, containing the modulus, private exponent and public exponent) to the CRT format. It also support converting keys from CRT to SFM. Moreover, you free to choose the endianess of the input and the output values.
To see a screen-shot of the tool, click here.
To download the tool for Windows, click here.
The source code and all binaries (including for Linux/MacOSX) are available at Sourceforge : http://sourceforge.net/projects/rsaconverter/