Top rated sites
The highest SI Scores across the directory, based on the same published scoring rules.
OsEngine
github.comCollect market history and test several strategies in one portfolio
OsiriX
osirix-viewer.comExplore DICOM data with 2D and volume processing
OSL
osl.comInstitutional crypto quotes with settlement and business-account controls
Osmic
github.comSmall map symbols with configurable halos, shields and export collections.
OSS-Fuzz
google.github.ioContinuously fuzz accepted open-source projects to find crashes and other input-handling bugs.
Othership App
othership.usMusic-led guided breathwork grouped by intention and movement
Ouch
icons8.comIllustration packs spanning vectors, animation and 3D styles
Oura Browser
oura.devMac browser beta with per-site permissions and an AI panel
Outdoorsy
outdoorsy.comChoose between driving an RV and having it delivered
Overcast
overcast.fmAn Apple-device player with silence trimming and voice levelling
Overpass API
wiki.openstreetmap.orgA query API for retrieving selected OpenStreetMap features by tag, location, and object type.
OVHcloud Public Cloud Compute Instances
ovhcloud.comResizeable public-cloud virtual machines with API and infrastructure-as-code workflows.
OVHcloud VPS
ovhcloud.comAn SSH-administered virtual server for a custom Linux web stack.
OVID
ovid.tvDocumentaries and independent cinema organised for discovery
Oviond
oviond.comDeliver branded client dashboards and multi-page marketing reports.
OVPN
ovpn.comVPN service with optional multihop and a public IPv4 add-on
Owlfiles
skyjos.cnMove files among devices, NAS, servers and cloud drives
OwnWiki
own360.aiA self-hosted knowledge workspace that combines wiki pages, databases, ownership, and review trails.
OXID eShop
oxid-esales.comConfigurable B2B and B2C stores with stock-driven availability messages
Oyster
oysterhr.comGlobal payroll and HR platform for hiring and paying teams in more than 180 countries.
p5.js Web Editor
editor.p5js.orgA browser editor for creating, sharing and remixing p5.js sketches without local setup.