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Webinar recording "Choosing the Right Graph Database to Succeed in Your Project"
Slides and WebEx recording for the Feb'2016 webinar, summarising various use cases for semantic graph databases, as well as a variety of deployment options for Ontotext GraphDB - from a free version and single-node deployments, to high-availability clusters and a fully managed database-as-a-service in the Cloud

General S4 information

Documentation
Description
S4 Overview
General description of the product, its features and technology
Getting Started Guide
A concise guide to registering an account and using S4 as quickly as possible
Feedback and Support
Links to various channels for getting in touch with us (email, Twitter, ZenDesk and forums)
FAQ
A list of frequently asked questions
Change Log
A short list of bug fixes and new features for the last few versions
S4 blog Stay up to date with S4 related news and announcements
Further Reading
webinars, talks, papers and PR announcements about S4

Developers documentation

Documentation
Description
S4 Management Console
Information about account registration, preferences, reports and API key management 
Service endpoints
Endpoints of all S4 REST services
REST APIs
General information about the S4 REST APIs, security & usage quotas
Text Analytics services
Details about the text analytics REST services:
Knowledge Graphs
Details about the Knowledge Graph REST service (Linked Open Data access to DBpedia, Freebase/Wikidata & GeoNames via FactForge)
GraphDB in the Cloud (self managed)
Details about configuring and running a self-managed instance of GraphDB via the AWS Marketplace
Fully Managed Database (DBaaS)
Details about running a fully managed instance of GraphDB (DBaaS)
SDKs
various SDKs for accessing the S4 services:
text analytics frameworks plug-ins
plug-ins for accessing S4 services from other text analytics frameworks:
browser extensions
extensions for annotating web pages with S4 services within browsers:

Demos & Sample Code

Documentation
Description
Getting Started (extended)
an extended version of the Getting Started guide with practical examples of using S4 services
Sample code Sample code in for using the S4 services with Java, C#, cURL, Python, NodeJS, JavaScript, Groovy, and PHP
Twitter analytics demo
A demo that processes tweets with S4 and visualises the results with the Google Charts API
S4 Developers Challenge
Details about the S4 Developers Challenge - submit a cool S4 app/demo/add-on and win $1,000!