My favourite team tool is the KUDO box at Averbis. It allows you to share appreciation with your colleagues in a very creative way. That really is highly motivating and puts you in a good mood.
In general, we have flat hierarchies and an amazing atmosphere between colleagues and management. We can always express our thoughts bluntly.
And we can also partially decide by ourselves about what we want to work on and implement appropriate ideas, which we can discuss with the team to get helpful feedback. That of course is living the dream for a software engineer!