Looking for NOSQL engines I found about GT.M here: http://www.slideshare.net/robtweed/gtm-a-tried-and-tested-schemaless-database
At first look good, with SQL ODBC support. But I wonder if exist real experience with this? Somebody have use it?
Don't have experience with it myself, but there is a list of some users of this database here: http://fisglobal.com/Products/TechnologyPlatforms/GTM/index.htm