Open source focus
Open Source Alternatives to Castelion
48 open source Defense options similar to Castelion, ranked by named competitors first, sector overlap, and our 0-100 AI-readiness score. Each profile notes license and self-hosting where we have it.
- LOLockheed Martin29AerospaceBethesda, United States
Open source
SkyfireAI59AerospaceAustin, USA$19.5MOpen source
Airvolute45AerospaceTrnava, Slovakia$1.5MOpen source
Starfighters Space63AerospaceKennedy Space Center, USA$17.5MOpen source
Vanilla Aircraft47AerospaceFalls Church, United StatesOpen source
Orange Sky Defense39Defense TechIsrael, Israel$1.0MOpen source
SpearUAV31DronesTel Aviv, IsraelOpen source
Radomatics20AutomotiveTel Aviv, IsraelOpen source
9 Mothers10Hard TechAustin, United StatesOpen source
Quantum Machines69Quantum ComputingTel Aviv, Israel$293.0MOpen source
Landa Digital Printing673D PrintingRehovot, Israel$435.0MOpen source
JuliaHub62Artificial IntelligenceWaltham, USA$65.0MOpen source
D-Fend Solutions62DronesTel Aviv, Israel$59.0MOpen source
C3 AI61Artificial IntelligenceRedwood City, United States$1.0BOpen source
Overwatch Imaging55Defense TechHood River, USA$17.1MOpen source
- CYCyber Apex Solutions55Cybersecuritynull, US
Open source
Rainbow Robotics54RoboticsDaejeon, South Korea$213.3MOpen source
Falkbuilt Ltd.54Advanced ManufacturingCalgary, CanadaOpen source
Aura Aero54AerospaceToulouse, France$340.0MOpen source
Halo Digital53AI Enablers$11.0MOpen source
H2Pro53WaterTel Aviv, IsraelOpen source
Ouster, Inc.53LIDARSan Francisco, United States$161.0MOpen source
MORPHEUS SPACE53SpaceTechPotsdam, GermanyOpen source
Datablanket53FireSan Francisco, United States$4.0MOpen source
Comand AI52Defense TechParis, France$32.0MOpen source
Magentic51MFG + SUPPLY CHAINSan Francisco, United States$14.6MOpen source
WaiV Robotics50RoboticsSouthampton, United Kingdom$7.5MOpen source
Mynaric50SpaceTechMunich, Germany$100.0MOpen source
CyberBee50DronesTel Aviv, Israel$900KOpen source
Unitree Robotics50Humanoid RoboticsHangzhou, ChinaOpen source
Ideon Technologies48Computer VisionTel Aviv, Israel$21.0MOpen source
Gaius.AI48ManufacturingTel Aviv, Israel$10.0MOpen source
Cyviation43CybersecurityTel Aviv, Israel$4.0MOpen source
Runtime Verification41Software VerificationChampaign, United StatesOpen source
Sky-Spy39Defense Tech$16.0MOpen source
Virtual-Crypto31FintechOpen source
Kiinns30Food SafetyTel Aviv, IsraelOpen source
Seahawk Robotics29Drone TechnologySan Diego, United StatesOpen source
General Electric28ConglomerateBoston, United StatesOpen source
Miltech Hellas25Defense TechAthens, GreeceOpen source
Motherson Group25Automotive ComponentsNoida, IndiaOpen source
Assembrix213D PrintingTel Aviv, IsraelOpen source
Leidos21DefenseReston, United StatesOpen source
Aemetis15Climate TechCupertino, United StatesOpen source · Self-hostable
3dfy Labs143D ScanningToronto, CanadaOpen source
exantrix14EnterpriseSaint-Étienne, FranceOpen source
Aether IntelAI Search EngineWashington, United StatesOpen source
AstronavisSpaceTechPalo Alto, United StatesOpen source
| Company | Sector | License | HQ | Funding | Score | Website |
|---|---|---|---|---|---|---|
| LOLockheed Martin | Aerospace | Open source | Bethesda, United States | — | 29 | |
| SkyfireAI | Aerospace | Open source | Austin, USA | $19.5M | 59 | |
| Airvolute | Aerospace | Open source | Trnava, Slovakia | $1.5M | 45 | |
| Starfighters Space | Aerospace | Open source | Kennedy Space Center, USA | $17.5M | 63 | |
| Vanilla Aircraft | Aerospace | Open source | Falls Church, United States | — | 47 | |
| Orange Sky Defense | Defense Tech | Open source | Israel, Israel | $1.0M | 39 | |
| SpearUAV | Drones | Open source | Tel Aviv, Israel | — | 31 | |
| Radomatics | Automotive | Open source | Tel Aviv, Israel | — | 20 | |
| 9 Mothers | Hard Tech | Open source | Austin, United States | — | 10 | |
| Quantum Machines | Quantum Computing | Open source | Tel Aviv, Israel | $293.0M | 69 | |
| Landa Digital Printing | 3D Printing | Open source | Rehovot, Israel | $435.0M | 67 | |
| JuliaHub | Artificial Intelligence | Open source | Waltham, USA | $65.0M | 62 | |
| D-Fend Solutions | Drones | Open source | Tel Aviv, Israel | $59.0M | 62 | |
| C3 AI | Artificial Intelligence | Open source | Redwood City, United States | $1.0B | 61 | |
| Overwatch Imaging | Defense Tech | Open source | Hood River, USA | $17.1M | 55 | |
| CYCyber Apex Solutions | Cybersecurity | Open source | null, US | — | 55 | |
| Rainbow Robotics | Robotics | Open source | Daejeon, South Korea | $213.3M | 54 | |
| Falkbuilt Ltd. | Advanced Manufacturing | Open source | Calgary, Canada | — | 54 | |
| Aura Aero | Aerospace | Open source | Toulouse, France | $340.0M | 54 | |
| Halo Digital | AI Enablers | Open source | — | $11.0M | 53 | |
| H2Pro | Water | Open source | Tel Aviv, Israel | — | 53 | |
| Ouster, Inc. | LIDAR | Open source | San Francisco, United States | $161.0M | 53 | |
| MORPHEUS SPACE | SpaceTech | Open source | Potsdam, Germany | — | 53 | |
| Datablanket | Fire | Open source | San Francisco, United States | $4.0M | 53 | |
| Comand AI | Defense Tech | Open source | Paris, France | $32.0M | 52 | |
| Magentic | MFG + SUPPLY CHAIN | Open source | San Francisco, United States | $14.6M | 51 | |
| WaiV Robotics | Robotics | Open source | Southampton, United Kingdom | $7.5M | 50 | |
| Mynaric | SpaceTech | Open source | Munich, Germany | $100.0M | 50 | |
| CyberBee | Drones | Open source | Tel Aviv, Israel | $900K | 50 | |
| Unitree Robotics | Humanoid Robotics | Open source | Hangzhou, China | — | 50 | |
| Ideon Technologies | Computer Vision | Open source | Tel Aviv, Israel | $21.0M | 48 | |
| Gaius.AI | Manufacturing | Open source | Tel Aviv, Israel | $10.0M | 48 | |
| Cyviation | Cybersecurity | Open source | Tel Aviv, Israel | $4.0M | 43 | |
| Runtime Verification | Software Verification | Open source | Champaign, United States | — | 41 | |
| Sky-Spy | Defense Tech | Open source | — | $16.0M | 39 | |
| Virtual-Crypto | Fintech | Open source | — | — | 31 | |
| Kiinns | Food Safety | Open source | Tel Aviv, Israel | — | 30 | |
| Seahawk Robotics | Drone Technology | Open source | San Diego, United States | — | 29 | |
| General Electric | Conglomerate | Open source | Boston, United States | — | 28 | |
| Miltech Hellas | Defense Tech | Open source | Athens, Greece | — | 25 | |
| Motherson Group | Automotive Components | Open source | Noida, India | — | 25 | |
| Assembrix | 3D Printing | Open source | Tel Aviv, Israel | — | 21 | |
| Leidos | Defense | Open source | Reston, United States | — | 21 | |
| Aemetis | Climate Tech | Open source · Self-hostable | Cupertino, United States | — | 15 | |
| 3dfy Labs | 3D Scanning | Open source | Toronto, Canada | — | 14 | |
| exantrix | Enterprise | Open source | Saint-Étienne, France | — | 14 | |
| Aether Intel | AI Search Engine | Open source | Washington, United States | — | — | |
| Astronavis | SpaceTech | Open source | Palo Alto, United States | — | — |