Another cool tool. This is from a UK site so they call these "plenaries" but they are 140 lesson plan ideas. You'll have to sign up for a free TES account but this is a cool powerpoint.
A panel of language teachers ranging from French, German, Spanish, Welsh, and more. You can click on their names on this list and download their lesson plans.
Here is an interesting point as I research inquiry based learning and move to look in a database that is largely built from overseas. Many places called "inquiry" "enquiry" so in this set of lessons across the curriculum, I have to search using the term "enquiry" to turn up what have been tagged as "inquiry based" lesson plans.
There are many nuances like that as you start looking at best practices across the world to remember. Eventually, hopefully, language searches will translate between common languages (like English) to help us bridge best practices.
If you're looking into inquiry-based learning (or equiry-based depending upon where you're from) - this is a database of lesson plans from Kindergarten up in different categories.