I use SqlAnyWhere 16, because it has many functionalities:
1.- Supports up to 32,000 concurrent connections.
2.- You can declare SOAP WebServices with JSON, RAW, XML formats. No need IIS
3.- You can create events to run external applications.
4.- You can schedule backups and maintenance to the database.
5.- You can schedule tasks.
6.- You can link database server tables such as Oracle, SqlAnywer and other servers. This means that you can make an insert in SqlAnyWhere and the data will be saved in the linked database.
7.- You can make this database server run as an application or as a service.
8.- It's fast an easy to install, my application install and setup a "server" in 3 mins with just one click
9.- Run in the Cloud (I have personally tested it with AWS)
And finally it's free.
If you want more information write me:
adolfochairez@yahoo.com