How to create a movie from several .bmp-files under Linux?

I have generated 90 .bmp files and now would like to generate a 3 second video with 30 frames per second from this. Preferrably in the .mov format, but any common format would be ok. Is there any (free) program available that can do this?

ffmpeg can create a .mov for you.

See this section of the ffmpeg FAQ.

You may like to try something such as:

ffmpeg -f image2 -r 30 -i img%d.bmp ./out.mov

If you'd like a graphical interface, Kino will do this.

Kino is a non-linear Digital Video (DV) editor that supports video capture in raw DV or AVI format (type 1 and type 2 DV, with separate audio streams); loading of multiple video and audio clips for editing, cutting and pasting portions of those clips; exporting the composite movie to DV over IEEE 1394, raw DV, DV AVI, still frames, WAV, MP3, Ogg Vorbis, MPEG-1, MPEG-2, MPEG-4; importing of still frames in a variety of formats (eg, GIF, TIFF, JPEG, PNG, PPM, BMP, SVG, Targa, XPM); audio and video playback; multilingual interface; PAL and NTSC; a variety of effects, audio and video filters, video transitions, audio transition (crossfade); etc. This is a Linux program.