If a data publishers cannot find a relevant vocabulary, or existing vocabularies are not good enough/suitable for the use case, they can make their own ontology. They can be helped by editors, such as:

This requires considerable efforts and requires some guidelines.Here are best practices:

The Resource Description Framework (RDF) is a family of World Wide Web Consortium (W3C) specifications originally designed as a metadata data model.It has come to be. The Free Version of the PDF-XChange Editor is a light weight, easy to use application with many free features including: direct text editing of text-based PDF documents, OCR a PDF, annotations and markup tools, the ability to save and send fillable PDF form data, and free plugins allow easy access to third-party storage sites and servers such as Google Drive & SharePoint. .rdf - Resource Description Framework. The RDF document files are related to RDF Editor.RDF file is a Resource Description Framework document.

DontWorryBeCrappy: it's ok to do it wrong, it can improve later;
Best Practice Recipes for Publishing RDF Vocabularies.

Protégé

Description: ontology editor (popular, pluggable).

Available at:http://protege.stanford.edu/

Unique strength:

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NeOn Toolkit

Description: is another ontology editor with many pluggins available. It is especially suited for heavy-weight projects (e.g., multi-modular ontologies, multi-lingual, ontology integration, etc).

Available at:http://neon-toolkit.org/

Unique strength:

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SWOOP

Description: is a small and simple ontology editor.

Available at:http://www.mindswap.org/2004/SWOOP/ (offline)

Unique strength:

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Neologism

Description: is an online vocabulary editor and publishing platform.

Available at:http://neologism.deri.ie/ (offline)

Unique strength:

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TopBraid Composer

Description: is a multipurpose Semantic Web editor.

Available at:https://www.topquadrant.com/products/topbraid-composer/

Unique strength:

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Vitro

Description: is an Integrated Ontology Editor and Semantic Web Application.

Available at:http://vitro.mannlib.cornell.edu/ (offline)

Unique strength:

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Knoodl

Description: is a community-oriented ontology and knowledge base editor.

Available at:http://www.knoodl.com/ (offline)

Unique strength:

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Anzo for Excel

Description: will generate an initial ontology based on spreadsheet data and structure.

Available at:https://docs.cambridgesemantics.com/anzo/

Unique strength:

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OWLGrEd

Description: a graphical ontology editor for OWL.

Rdf Editor Download

Available at:http://owlgred.lumii.lv/

Unique strength:

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Rdf Editor Online

Fluent Editor

Description: a comprehensive tool for editing and manipulating complex ontologies that uses Controlled Natural Language.

Available at:http://www.cognitum.eu/Semantics/FluentEditor/

Unique strength: instant natural language representation of OWL/SWRL boosts productivity and makes much easier to read and understand edited ontologies.

Possible drawback:

Easy Disk Catalog Maker is the fastest application for cataloging and indexing files, stored on your disks (e.g. Hard Drives, DVDs, Blu-rays, Network drives etc.). It helps you find a file you are looking for in seconds without even connecting all those disks to the PC. Simple Disk Catalog is a cataloging software and especially used for cataloging Disks. It lets you create catalogs for contents of your CDs. It is a cataloging software which can automatically fetch data from CDs and other Disks. You can also view their contents even after you take out the disk. Disk catalog software. How WinCatalog disk catalog software works Scan and index your disks with WinCatalog just once, and WinCatalog will automatically create a catalog of your disks, files, and folders. Organize your catalog of disks, files, and folders, using tags (categories), virtual folders and any user defined fields.

Open Source Pdf Editor

Semantic Turkey

Description: a Knowledge Management and Acquisition Platform. OSGi-based framework plus various clients. The embedded client is a Firefox extension.

Available at:http://semanticturkey.uniroma2.it/

Unique strength: its Firefox interface allows for Semantic Annotation and/or Knowledge Acquisition (annotated text content can be used to produce new Semantic content). Support for OWL/SKOS/SKOS-XL

Possible drawback: support for OWL is limited. To version 0.10, there is no support for editing OWL Restrictions.

VocBench

Description: a Collaborative Environment for SKOS-XL Thesauri (conversion to plain SKOS is also supported)

Available at:http://vocbench.uniroma2.it/

Unique strength: Strong support for collaboration and a detailed editorial workflow

Possible drawback:

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