Obsidian Citations plugin
As nobody mentioned it yet, I have to do it. On a first view, it may seem rather simple as compared to some other, really amazing plugins - and yes, further development seems to be lagging behind the author’s original intentions, but even the plugin’s basic functions are incredibly useful.
For me as a (part-time) researcher, much of obsidian’s power couldn’t be realized if I wouldn’t have the possibility to access my bibliography directly from within obsidian, linking my arguments and ideas to articles and books - and all of that without interrupting my current workflow!