Does anyone know a good freeware program to convert .OGM to .AVI?

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For those of you not familiar with these extensions, they are video files, and I am looking for a decent program that can convert this particular video format to an .avi. If anyone has any suggestions please let me know. Since people are not supposed to link to other sites here, just tell me what search term to google so I can find the program. . .I've already tried typing in .ogm to .avi and got nothing but shareware. .