Similar to 第21回全米映画俳優組合賞

Open Source Virtual Reality

OpenAI Five

OpenBitTorrent

OpenCores

OpenDaylight Project

OpenEmbedded

Openmoko

OpenMosix

OpenRC

OpenRefine

OpenServer

OpenSUSE Project

Optics Express

Optics Letters

Orca (assistive technology)

ORCA (quantum chemistry program)

ORCID

OSDN

OW2

PAOK FC

PDFtk

Polis Diraja Malaysia FC

2015 in the United States

Semantic Scholar

2015 Umpqua Community College shooting

2015 Philadelphia train derailment

Aliso Canyon gas leak