This is the first stable release of Panelizer! What does this mean? It does not mean we're at feature parity with D7 panelizer. However, in general, you should be able to use this module in production, while be confident that data is safe and will have an upgrade path in future releases.
Note: this requires Drupal 8.3.x, it is not compatible with 8.2.x.
This is the second beta release of the Search API Multilingual Solr Search. The minimum "officially supported" Solr version is still 4.5.1. The automated tests cover Solr versions up to Solr 6.4.2. For Solr 6.5.0 there's a known issue in solarium.