thunderdome.ogg (-Sector11) by MashedByMachines is licensed under CC-BY-NC-SA-3.0. It was converted from MP3 to OGG. The source can be found here: https://www.newgrounds.com/audio/listen/312622

endless_space.ogg (Endless Space) by SolusLunes is licensed under CC-BY-3.0. It was converted from MP3 to OGG. The source can be found here: https://www.newgrounds.com/audio/listen/67583

space_asshole.ogg (Space Asshole) by Chris Remo is used with special permission from the author, under the condition that the project remains non-commercial and open source. At the author's request, here is a link to his bandcamp: https://chrisremo.bandcamp.com/

absconditus.ogg (Absconditus) by ZhayTee is licensed under CC-BY-NC-SA-3.0. It was converted from MP3 to OGG. The source can be found here: https://bandcamp.zhaytee.net/track/absconditus

atomicamnesiammx.ogg (Atomic Amnesia MMX) by Phillip Dyer is licensed under CC-BY-NC-SA-3.0. It was converted from MP3 to OGG. The source can be found here: https://soundcloud.com/3kliksphilip/atomic-amnesia-mmx-1