Today, Gerald Venzl announced the general availability of the free version of the Oracle database 21c: the eXpress Edition (or XE) for Linux platforms (direct links are provided inside the original announcement, see at the end of this post).
Gerald also mentioned an important update to Oracle Database 21c XE: it lifts the restriction on the number of pluggable databases! Unlike the previous version of Oracle Database XE, which only allowed up to 3 Pluggable Databases (PDBs), Oracle Database 21c XE now includes all functionality of the Multitenant feature!
This version provides all the features of a true converged database, providing support for Relational, JSON, XML, Graph, Spatial, Blockchain, Object, and Key/Value data for free. Data access can also be REST-enabled, when combined with Oracle REST Data Services, allowing interaction with the data over standard RESTful web services. In addition, Oracle Application Express (APEX), Oracle’s popular low-code app development platform, can be easily deployed on top of Oracle Database 21c XE!
More details about the announcement are here.