- ORS
- ORT
- OS4Dev/Criteria
- OS4Dev/Packages
- OSAT
- OSAT-Protractor
- OSAT: Unicef Developmental Kit - Dominoes for Children
- OSAT 3D-Printable Designs
- OSAT 3D Printable Treadle Pump
- OSAT 3D Printed Finger Splint
- OSAT 3D Printed Finger Splint/ru
- OSAT 3D Printed Hand Pump
- OSAT 3D Printed Hand Pump/pl
- OSAT Bike Pedal
- OSAT Bike Seat
- OSAT Clip Project
- OSAT Jump Rope Design
- OSAT Project -- Cutting Tool
- OSAT Wind Turbine
- OSAT project
- OSAT project - Infantometer
- OSAT project COMING SOON
- OSAT toilet paper holder
- OSE
- OSHE
- OSHE Blood Glucose Meter
- OSHE Blood Glucose Meter/es
- OSHE Bread Applications
- OSHE Cinematography Quadcopter
- OSHE Cinematography Quadcopter/Appendix
- OSHE Cinematography Quadcopter/Concept design
- OSHE Cinematography Quadcopter/Detailed Design and Analysis
- OSHE Growbot
- OSHE Growbot/ar
- OSHE Growbot/fr
- OSHE Growbot Axle
- OSHE Growbot BOM
- OSHE Growbot Drivetrain
- OSHE Growbot Electrical
- OSHE Growbot Firmware
- OSHE Growbot Frame
- OSHE Growbot Guidance System
- OSHE Growbot Motor Encoders
- OSHE Growbot Mounting Units
- OSHE Growbot Printed Parts
- OSHE Growbot Standard Operating Procedures
- OSHE Growbot Tools
- OSHE Growbot Wire Prep
- OSHE Growbot Wiring
- OSHE High Temperature 3D Printer
- OSHE Industrial Recyclebot
- OSHE LiDAR Bot
- OSHE Near Field Audio Speaker
- OSHE Open Water
- OSHE Print Farm Automation
- OSHW
- OSHWA
- OSL
- OSN
- OSNC08
- OSNCamp/planning future events
- OSNCamp2008
- OSNCamp2008/Accomodation
- OSNCamp2008/Email notices
- OSNCamp 2008
- OSNCamp 2008/Accommodation
- OSNCamp 2008/Accomodation
- OSNCamp 2008/Contact
- OSNCamp 2008/Experiences
- OSNCamp 2008/FAQ
- OSNCamp 2008/Facebook invite
- OSNCamp 2008/For attendees
- OSNCamp 2008/Invite
- OSNCamp 2008/OSNCamp Online
- OSNCamp 2008/Press
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- OSNCamp 2008/Schedule
- OSNCamp 2008/Schedule/id
- OSNCamp 2008/Social events
- OSNCamp 2008/Sponsors
- OSNCamp 2008/Volunteer
- OSNCamp 2008/format
- OSNCamp 2008/online participants
- OSNCamp 2008/planning
- OSNCamp 2008/presentations
- OSNCamp 2008 - CARES
- OSNCamp 2008 Proceedings
- OSNCamp 2008 Undaunted
- OSNCamp London 2008
- OSNCamp Mid Missouri
- OSNCamp Mid Missouri/Agenda
- OSNCamp Mid Missouri/Proceedings
- OSNCamp online
- OSNCon
- OSNCon/About
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- OSNCon/Couches
- OSNCon/FAQ
- OSNCon/For attendees
- OSNCon/Invite
- OSNCon/Press
- OSNCon/Registration
- OSNCon/Schedule
- OSNCon/Sponsors
- OSNCon/Volunteer
- OSNCon/carpool
- OSN Camp 2008 Open Source Ecology: Flex Fab and the Living Collaboratory
- OSN MOU
- OSN Members
- OSN Open Education
- OSN member pledge
- OSN members
- OSN members/Suggested members
- OSOTF
- OSSTIP
- OSSTIP/Loading GTFS to a GIS database
- OSSTIP/Notes on getting OpenTripPlanner Batch Analyst working
- OSSTIP/OpenTripPlanner Issues
- OSSTIP/Project blog
- OSSTIP/Setup of OpenTripPlanner to display Melbourne PT network
- OSSTIP/SimpleGTFSCreator
- OSSTIP/WP1
- OSSTIP/WP2
- OSSTIP/WP3
- OSSTIP/WP4
- OSSTIP/WP5
- OSSTIP/WP6
- OSSTIP/WPBZE1
- OSSTIP/WPBZE2
- OSSTIP/WPBZE3
- OSSTIP/WPBZE4
- OSSTIP/WPPTUA1
- OSSTIP/WPPTUA2
- OSSTIP/WPPTUA3
- OSSTIP/WPPTUA4
- OSSTIP/WP Progress Archive
- OSSTIP/visualise OD matrix in QGIS
- OSU Bike Trailer
- OSU Cooking Class
- OSU Green Roof
- OSU Hydrogen Trailer
- OSU Permaculture Group
- OSU Solar Vehicle Team
- OSU Student Sustainability Initiative
- OSU Student Sustainability Inititaive
- OS Rheometer (from MIT):FAST
- OTRC Knee Joint
- Oak
- Oakton StableTemp Economy Oven
- Oaxaca
- Oaxaca Water Quality Forum
- Object oriented OpenSCAD
- Objectified (documentary)
- Oblique Plane Deformity - Graphical method
- Oblique Plane Deformity - Graphical method/ko
- Observation of the environment by telescope
- Observational Energy Assessment
- Observational U.S. home energy assessment
- Observatorio de Género y Justicia Ambiental (PNUD Bootcamp 2023)
- Observer status (international environmental agreement negotiations)
- Obvious 3D printer technology based on 01. Segmentation
- Obvious 3D printer technology based on 02. Extraction
- Obvious 3D printer technology based on 03. Local Quality
- Obvious 3D printer technology based on 04. Asymmetry
- Obvious 3D printer technology based on 05. Combination
- Obvious 3D printer technology based on 06. Universality
- Obvious 3D printer technology based on 07. Nesting
- Obvious 3D printer technology based on 08. Counterweight
- Obvious 3D printer technology based on 09. Prior Counteraction
- Obvious 3D printer technology based on 1. Segmentation
- Obvious 3D printer technology based on 10. Prior Action
- Obvious 3D printer technology based on 11. Cushion in Advance
- Obvious 3D printer technology based on 12. Equipotentiality
- Obvious 3D printer technology based on 13. Inversion
- Obvious 3D printer technology based on 14. Spheroidality
- Obvious 3D printer technology based on 15. Dynamicity
- Obvious 3D printer technology based on 16. Partial, overdone or excessive action
- Obvious 3D printer technology based on 17. Moving to a new dimension
- Obvious 3D printer technology based on 18. Mechanical vibration
- Obvious 3D printer technology based on 19. Periodic action
- Obvious 3D printer technology based on 2. Extraction
- Obvious 3D printer technology based on 20. Continuity of useful action
- Obvious 3D printer technology based on 21. Rushing through
- Obvious 3D printer technology based on 22. Convert harm into benefit
- Obvious 3D printer technology based on 23. Feedback
- Obvious 3D printer technology based on 24. Mediator
- Obvious 3D printer technology based on 25. Self-service
- Obvious 3D printer technology based on 26. Copying
- Obvious 3D printer technology based on 27. Inexpensive short life
- Obvious 3D printer technology based on 28. Replacement of a mechanical system
- Obvious 3D printer technology based on 29. Use pneumatic or hydraulic systems
- Obvious 3D printer technology based on 3. Local Quality
- Obvious 3D printer technology based on 30. Flexible film or thin membranes
- Obvious 3D printer technology based on 31. Use of porous materials
- Obvious 3D printer technology based on 32. Changing the colour
- Obvious 3D printer technology based on 33. Homogeneity
- Obvious 3D printer technology based on 34. Rejecting and regenerating parts
- Obvious 3D printer technology based on 35. Transforming physical or chemical states
- Obvious 3D printer technology based on 36. Phase transition
- Obvious 3D printer technology based on 37. Thermal expansion
- Obvious 3D printer technology based on 38. Use strong oxidisers
- Obvious 3D printer technology based on 39. Inert environment
- Obvious 3D printer technology based on 4. Asymmetry
- Obvious 3D printer technology based on 40. Composite materials
- Obvious 3D printer technology based on 5. Combination
- Obvious 3D printer technology based on 6. Universality
- Obvious 3D printer technology based on 7. Nesting
- Obvious 3D printer technology based on 8. Counterweight
- Obvious 3D printer technology based on 9. Prior Counteraction
- Obvious 3D printing inventions that can not be patented
- Obvious 3D printing inventions that can not be patented/zh
- Occidental Greywater
- Occidental greywater
- Occidental greywater/es
- Occupy Sustainability
- Occupy farms
- Ocean Pollution - Great Pacific Garbage Patch
- Ocean acidification
- Ocean acidification/es
- Ocean acidification/it
- Ocean acidification/si
- Ocean current
- Ocean energy conversion system
- Ocean wave energy conversion system
- Oceans
- Oceans-Climate School
- Octayurt
- Octoyurt
- Ode to the Tech Fix - Chris Malins
- OdoReader
- OdoReader/de
- Odocs
- Odon Device for assisted vaginal delivery
- Odor Baited Station
- Of Arms and the Man - James Hester
- Off-grid
- Off-the-grid
- Off-the-grid/nl
- Off-the-grid/pt
- Off grid photovoltaic system on Fickle Hill
- Off the grid
- Offgassing
- Official development assistance
- Offline browsing
- Offline content
- Offline content collaboration
- Offline content creation
- Offshore Wind Farms
- Ohio
- Ohio community action
- Ohm's Law
- Oil
- Oil Extraction (Practical Action Brief)
- Oil Extraction (Practical Action Brief)/mr
- Oil Soaked Wood Bearings (Practical Action Technical Brief)
- Oil Soaked Wood Bearings (Practical Action Technical Brief)/ru
- Oil dependency
- Oilcloth
- Oils
- Oilseed
- Ojiya-Chijimi y Echigo-jofu
- Oklahoma
- Oklahoma community action
- Okra
- Okra/mr
- Old Growth Cellar rainwater catchment
- Old Time Ads
- Old Time Various How to Do It
- Ole Ersson
- Olympia, Washington
- Olympia community action
- Omron HEM-Solar
- On Lying to Children - Hestia Peppe
- On Lying to Children - Peep
- On Watermills in Central Crete
- On becoming a conservative - Vinay Gupta
- On becoming an adult - Eleanor Saitta
- On the Drawing Board
- On the Future We Deserve… - Antonio Dias
- On the Hyphae drawing board
- On the care of soils
- Onderdonk's Box Instructions
- OneHotPotato
- One Bryant Park
- One Bryant Park/zh
- One Laptop Per Child
- One Laptop per Child
- One Pot Two Pot...Jackpot
- One Sheet Solar Cooker
- One Way Ratchet
- One Way Ratchet/es
- One big wiki
- One in Six, a Strategy for Reduction - Glenn Hall
- Ongoing Collaboratories
- Onions
- Online Open Distance Learning - Anil Prasad
- Online collaboration
- Online communities
- Online community
- Online community asset mapping
- Online courses and materials
- Online platforms for collaborative consumption
- Online volunteering
- Ontario
- Ontario Snow Resorts Association
- Ontario community action
- Open
- Open-Island
- Open-Island/de
- Open-Island book
- Open-Labware.net
- Open-Labware.net/zh
- Open-Source 3D-Printable Optics Equipment
- Open-Source 3D Printed Surgical Retractors
- Open-Source Automated Mapping Four-Point Probe
- Open-Source Centrifuges
- Open-Source Colorimeter
- Open-Source Design and Economics of Manual Variable-Tilt Angle DIY Wood-Based Solar Photovoltaic Racking System
- Open-Source Designs for Distributed Manufacturing of Low-Cost Customized Walkers
- Open-Source Flexible Materials Tensile Testing Apparatus
- Open-Source Grinding Machine for Compression Screw Manufacturing
- Open-Source Grinding Machine for Compression Screw Manufacturing/de
- Open-Source Grinding Machine for Compression Screw Manufacturing/fr
- Open-Source Grinding Machine for Compression Screw Manufacturing/ru
- Open-Source Grinding Machine for Compression Screw Manufacturing/tr
- Open-Source Grinding Machine for Compression Screw Manufacturing/vi
- Open-Source Hardware
- Open-Source Hardware May Address the Shortage in Medical Devices for Patients with Low-Income and Chronic Respiratory Diseases in Low-Resource Countries
- Open-Source Lab
- Open-Source Lab:How to Build Your Own Hardware and Reduce Research Costs
- Open-Source Laser Welder
- Open-Source Medical Hardware for Pandemics
- Open-Source Medical Hardware for Pandemics/zh
- Open-Source Microcontrollers
- Open-Source Optics
- Open-Source Photometric System for Enzymatic Nitrate Quantification
- Open-Source Photometric System for Enzymatic Nitrate Quantification/hi
- Open-Source Photometric System for Enzymatic Nitrate Quantification/zh
- Open-Source Script for Design and 3D Printing of Porous Structures for Soil Science
- Open-Source Syringe Pump Library
- Open-Source Three-Dimensional Printable Infant Clubfoot Brace
- Open-Source Three-Dimensional Printable Infant Clubfoot Brace/zh
- Open-Source Vertical Swinging Wood-Based Solar Photovoltaic Racking Systems
- Open-licensed
- Open-o-Meter