Sure, here are a few software tools that you can use to explore the WordNet database:

1. NLTK (Natural Language Toolkit): A popular Python library for working with human language data, including WordNet.

2. Global Wordnet Grid: An online platform that provides access to various wordnets in different languages, including English WordNet.

3. WordNet Domains Explorer: A web-based tool that allows you to explore the semantic domains of WordNet synsets.

4. WordNet Browser: A Java-based graphical user interface for browsing and searching WordNet.

5. Artha: A free and open-source offline thesaurus software that uses WordNet as its database.