If it is necessary, don't be afraid of creating your own tools. We have an internal tile editor but it certainly isn't in the same state as Tiled and is a long way off commercial tools. It is however more fit for purpose for our game than any of the others we had found. In other words, it would take longer to understand how the plugin system works for a 3rd party tool than it did to just knock together our own.
Here are a few of our tools. You can see how rough they are ;)
(One day we do aim to clean them up to release to allow modding for the actual game but polishing is pretty time consuming lol)
This map editor isn't actually tiling. Our days or tiling map editors ended once we realized none of us were very good at pixel art ;)
Both were coded in C++ and wxWidgets and it works on all our development platforms (something proprietary tools fail to do). All in all, it probably took about a day or two for each one but features were added as we needed them so I am not sure of total coding hours. Well worth it though because now we aren't relying on companies owning tools like Unity or Spine to stay in business or to keep up support of a feature