Darktable and RawTherapee are fairly Lightroom-like (but different enough that you shouldn't be surprised when things are, well, different), but Filmulator migh

Darktable and RawTherapee are fairly Lightroom-like (but different enough that you shouldn't be surprised when things are, well, different), but Filmulator might actually be the best fit for your preferences. Regardless, the best way to get an answer to your question about DNG is probably to try some of these programs with your files and see if you encounter any problems. DNG is typically better supported than camera-specific raw formats.