gfx/prlogo.png
gfx/sflogo.png
gfx/alienDevice.png

Author: Parallel Realities <http://www.parallelrealities.co.uk/>
License: GNU GPLv2 or later <https://gnu.org/licenses/old-licenses/gpl-2.0.html>

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gfx/iconBase.png
gfx/arrowEast.png
gfx/arrowNorth.png
gfx/arrowNorthEast.png
gfx/arrowNorthWest.png
gfx/arrowSouth.png
gfx/arrowSouthEast.png
gfx/arrowSouthWest.png
gfx/arrowWest.png
gfx/stunBolt.png
gfx/redDir.png
gfx/greenDir.png
gfx/sellIcon.png
gfx/buyIcon.png
gfx/gameover.png
gfx/explode13.png
gfx/explode14.png
gfx/explode15.png
gfx/explode16.png
gfx/icon1.png
gfx/icon2.png
gfx/icon3.png
gfx/icon6.png
gfx/icon7.png
gfx/icon11.png
gfx/explode9.png
gfx/explode10.png
gfx/explode11.png
gfx/explode12.png
gfx/explode1.png
gfx/explode1.png
gfx/explode3.png
gfx/explode4.png
gfx/elec1.png
gfx/elec2.png
gfx/elec3.png
gfx/elec4.png
gfx/chainLink.png
gfx/cursor.png
gfx/smallFont.png
gfx/targetText.png
gfx/gameover.png
gfx/icon8.png
gfx/plasmaGreen.png
gfx/plasmaRed.png

Author: Astrid S. de Wijn
License: CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0/>

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gfx/face_chris.png
gfx/face_phoebe.png
gfx/face_sid.png
gfx/face_ursula.png

Author: CharlesGabriel <http://cgartsenal.blogspot.com/>
License: CC BY 3.0 <https://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/48x48-faces-2nd-sheet

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gfx/face_crew.png
gfx/face_krass.png

Author: CharlesGabriel <http://cgartsenal.blogspot.com/>
License: CC BY 3.0 <https://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/48x48-faces-3rd-sheet

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gfx/face_kline.png

Authors:
  CharlesGabriel <http://cgartsenal.blogspot.com/>
  Astrid
License: CC BY 3.0 <https://creativecommons.org/licenses/by/3.0/>
Sources:
  http://opengameart.org/content/48x48-faces-2nd-sheet
  http://opengameart.org/content/48x48-faces-4th-sheet
Details:
  Astrid combined parts from the two sheets.

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gfx/planet_sun.png

Author: NASA <http://sdo.gsfc.nasa.gov/>
License: Public Domain
Source: http://opengameart.org/content/the-sun

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gfx/planet_blue.png
gfx/planet_green.png
gfx/planet_orange.png
gfx/planet_red.png

Author: athile <http://opengameart.org/users/athile>
License: CC BY 3.0 <https://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/planets-pack-8

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gfx/drone1.png
gfx/drone2.png
gfx/tug1.png
gfx/tug2.png
gfx/mineBoss1.png
gfx/mineBoss2.png
gfx/mineBossWing11.png
gfx/mineBossWing12.png
gfx/mineBossWing21.png
gfx/mineBossWing22.png
gfx/mineBossWing31.png
gfx/mineBossWing32.png
gfx/mineBossWing41.png
gfx/mineBossWing42.png
gfx/missileBoat1.png
gfx/missileBoat2.png
gfx/merc1.png
gfx/merc2.png

Authors:
  surt <http://opengameart.org/users/surt>
  astrid
License: CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0/>
Source: http://opengameart.org/content/astrominer-sprites

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gfx/mine.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-minebmp

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gfx/transport1.png
gfx/transport2.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-cargo2bmp

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gfx/dualFighter1.png
gfx/dualFighter2.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-hunter1bmp

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gfx/mobileCannon1.png
gfx/mobileCannon2.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-ship4bmp

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gfx/aimFighter1.png
gfx/aimFighter2.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-doomdaybmp

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gfx/barrier.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-beacon2bmp

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gfx/wingmate1.png
gfx/wingmate2.png
gfx/evilUrsula1.png
gfx/evilUrsula2.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-bshipbmp

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gfx/rebelCarrier1.png
gfx/rebelCarrier2.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-cargo1bmp

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gfx/sid1.png
gfx/sid2.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-ship2bmp

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gfx/kline11.png
gfx/kline12.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-hunter2bmp

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gfx/plutoBoss1.png
gfx/plutoBoss2.png
gfx/splitBoss11.png
gfx/splitBoss12.png
gfx/splitBoss21.png
gfx/splitBoss22.png
gfx/splitBoss31.png
gfx/splitBoss32.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-factory2bmp

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gfx/mobileShield1.png
gfx/mobileShield2.png

Author: Daniel Cook <http://lostgarden.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/iron-plague-warpbmp

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gfx/cloakShip1.png
gfx/cloakShip2.png

Author: Archanix <http://www.archanix.webs.com/>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/battlefront-operation-x-final-striker

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gfx/goodTrans1.png
gfx/goodTrans2.png

Authors:
  Rusty
  Archanix
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/ship-recoloring-001-for-gm-game

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gfx/escort1.png
gfx/escort2.png

Author: Clint Bellanger <http://opengameart.org/users/clint-bellanger>
License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/spaceship-360

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gfx/frigateBody1.png
gfx/frigateBody2.png
gfx/frigateGun11.png
gfx/frigateGun12.png
gfx/frigateGun21.png
gfx/frigateGun22.png

Authors:
  Skorpio <http://opengameart.org/users/skorpio>
  Astrid
License: CC BY-SA 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/spaceships-top-down

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gfx/miner1.png
gfx/miner2.png
gfx/slaveTrans1.png
gfx/slaveTrans2.png
gfx/eliteFighter1.png
gfx/eliteFighter2.png

Author: Skorpio <http://opengameart.org/users/skorpio>
License: CC BY-SA 3.0 <http://creativecommons.org/licenses/by/3.0/>
Source: http://opengameart.org/content/spaceships2-top-down

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gfx/icon5.png
gfx/firefly1.png
gfx/firefly2.png
gfx/firefly-big.png

Author: Lamoot
License: CC0 <http://creativecommons.org/publicdomain/zero/1.0/>
Source: http://opengameart.org/content/top-down-space-fighter-sprite

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gfx/icon9.png
gfx/icon10.png
gfx/icon12.png
gfx/icon14.png
gfx/icon15.png
gfx/icon16.png
gfx/icon17.png
gfx/icon23.png
gfx/rocket.png
gfx/superCharge.png
gfx/cargo1.png
gfx/plasmaDamage.png
gfx/plasmaAmmo.png
gfx/plasmaRate.png
gfx/heart.png
gfx/dollar.png
gfx/pod.png

Authors:
  Ails <http://ails.deviantart.com/>
  Astrid
License: CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>
Source: http://opengameart.org/content/420-pixel-art-icons-for-medievalfantasy-rpg

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gfx/icon13.png
gfx/icon18.png
gfx/icon19.png
gfx/icon20.png
gfx/icon22.png
gfx/icon24.png
gfx/icon25.png
gfx/rocketAmmo.png
gfx/rocket1.png
gfx/rocket2.png

Authors:
  OceansDream <http://oceansdream.deviantart.com/art/Pixel-Icons-available-for-use-121152370>
  Astrid
License: CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>
Source: http://opengameart.org/content/various-inventory-24-pixel-icon-set

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icon21.png

Authors:
  Torsten Henning
  Astrid
License: Public Domain
Source: http://en.wikipedia.org/wiki/File:DIN_4844-2_Warnung_vor_Laserstrahl_D-W010.svg

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icon4.png

Authors:
  Gobusto <http://opengameart.org/users/gobusto>
  Astrid
License: CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>
Source: http://opengameart.org/content/floppy-disk

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gfx/explode05.png
gfx/explode06.png
gfx/explode07.png
gfx/explode08.png

Author: Cuzco <http://opengameart.org/users/cuzco>
License: CC0 <http://creativecommons.org/publicdomain/zero/1.0/>
Source: http://opengameart.org/content/explosion

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gfx/asteroid1.png
gfx/asteroid2.png
gfx/asteroid3.png

Author: dczanik <http://opengameart.org/users/dczanik>
License: CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>
Source: http://opengameart.org/content/asteroid-rotating

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gfx/ore2.png

Author: phaelax <http://opengameart.org/users/phaelax>
License: CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>
Source: http://opengameart.org/content/asteroids

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gfx/ore1.png
gfx/ore3.png

Authors:
  phaelax <http://opengameart.org/users/phaelax>
  onpon4 <https://onpon4.github.io>
License: CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>
Source: http://opengameart.org/content/asteroids
Details:
  Made by colorizing phaelax's white asteroids in the GIMP.

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gfx/startUp.jpg

Author: NASA
License: Public Domain
Source: http://hubblesite.org/gallery/album/galaxy/pr2009014a/

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gfx/spirit.jpg

Author: NASA
License: Public Domain
Source: http://hubblesite.org/gallery/album/star/pr1992029a/warn/npp/all/

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gfx/eyananth.jpg

Author: NASA
License: Public Domain
Source: http://hubblesite.org/gallery/album/nebula/pr2009025e/

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gfx/mordor.jpg

Author: NASA
License: Public Domain
Source: http://hubblesite.org/gallery/album/nebula/pr2006001q/

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gfx/sol.jpg

Author: NASA
License: Public Domain
Source: http://hubblesite.org/gallery/album/star/pr2007004a/npp/all/

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gfx/credits.jpg

Author: NASA
License: Public Domain
Source: http://hubblesite.org/gallery/album/nebula/pr2005012b/