After a quick search I found these as other Web databases:

• Trackvia
  Described as a web 2.0 style database application, according to a recent review they try to simplify the use of the web db so that a dba is not needed. It strives to provide only the features that most people use while removing complexity.
  You get a 14 day trial period at a $29 cost for first user and $5 for each additional user.
  WebOffice
  
  An web based office suite which provides more than the Microsoft Suite. The suite includes a document manager, an online calendar, web meetings, web mail, task manager, web database, discussion forum, contact list, expense reports, and polls.
  
  Since it is web based it will run on any platform with web access. It has a monthly cost of $60 per month for 5 users and offers a 30 day free trial period.
  
• Dataweb
  Wikipedia describes Dataweba as:
  The Dataweb is an open source project started in 1995 to provide access to statistical data in the same way that the current world wide web provides access to documents. The data browser for the DataWeb is Data FERRETT (Federated Electronic Research Review Extraction Tablulation Tool) The url for this work can be found at http://www.thedataweb.org.
  The Dataweb is a new approach to distributed data sharing that applies the proven REST architecture principles of the World Wide Web to the sharing and linking of machine-readable data across domains and applications. This architecture is being pursued by the OASIS XDI Technical Committee in development of the XDI trusted data sharing protocol. As a user, Dataweb provides access to all kinds of data. As a participant in TheDataWeb community, you can publish your data. It provides access to many public data subjects.

• Dabble DB
  
  Built in Smalltalk an object oriented programming language developed as a research project at Xerox. Users claim that is so easy to use they can develop an application in 5 minutes. It allows you to import data from a spreadsheet of database.
  
  The company provides free access for a commons account which allows the data to be publicly accessible. Usage is fairly inexpensive at $10 per month for a single user of $25 for a 5 user license.
  

In addition the following 5 will be discussed in a future entry.

• Baseportal
• BizDB
• PostgreSQL
• QuickBase
• Zoho