RethinkDB is an open-source NoSQL database that was designed to make it easy to build real-time applications. The company was founded in 2009 and aimed to provide developers with a database that could handle the demands of modern web applications, particularly those requiring real-time data updates.

Key Features of RethinkDB:

1. Real-Time Updates: One of the standout features of RethinkDB is its ability to push real-time updates to applications. This means that when data changes in the database, those changes can be immediately sent to the client applications without the need for polling.

2. Query Language: RethinkDB uses a query language called ReQL, which is designed to be intuitive and powerful. It allows for complex queries and supports a variety of data types.

3. JSON Document Store: RethinkDB stores data in JSON format, making it easy to work with for developers familiar with JavaScript and web technologies.

4. Horizontal Scalability: The database is designed to scale out easily, allowing users to add more servers to handle increased loads without significant changes to the application.

5. Multi-Model Support: It supports various data models, including document and graph data models, which provides flexibility in how data can be structured and queried.

6. Built-in Administration Tools: RethinkDB comes with a web-based administrative interface that allows users to monitor performance, manage databases, and visualize queries.

Notable Mentions and Achievements:

• RethinkDB gained attention in the developer community for its focus on real-time data and ease of use, particularly for web developers building interactive applications.
• The project was initially funded through a successful Kickstarter campaign in 2012, which helped to raise awareness and support for its development.
• RethinkDB was well-received in various tech circles and was often compared to other NoSQL databases like MongoDB and Couchbase, particularly for its real-time capabilities.

However, it's important to note that RethinkDB faced challenges in maintaining its development momentum and community engagement over the years. In 2016, the company announced that it would cease active development, leading to concerns about the future of the database. Despite this, the open-source nature of RethinkDB means that the community can continue to use and develop it independently.

As of my last knowledge update in October 2023, RethinkDB remains available as an open-source project