Add link to OData.org which also maintains a list.

[opbld31]

Docs Build status updates of commit f1c8842:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
Odata-docs/resources/tools.md	:bulb:Suggestion	View	Details

Odata-docs/resources/tools.md

• Line 2, Column 1: [Suggestion-description-missing] Missing required attribute: 'description'.

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