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A collection of Kotlin Puzzlers
Code for the talk at GOTOCon Prague & Amsterdam about writing simple web apps - Plain Simple Java, and another one at Topconf - 3 tales of testing DB-enabled apps
Good looking public gallery for Google Photos (former Picasa web) that can be hosted for free on Google App Engine. In case you want you public gallery back after transition to Google Photos.
Geotag DSLR/non-phone camera photos using data from Google Maps Timeline
Java course from Tallinn Technical University, 2005-2011
Kotlin demo code for a conference talk