I've spent a few days researching this, and have actually found quite a lot of support for skinned animations in pascal, but information is scarce and some of it is outdated.:

GLTF - another masterpiece by bero, i haven't checked this out yet, but it's actively developed and bero is known for his quality and complete work:
https://github.com/BeRo1985/pasgltf
https://github.com/KhronosGroup/glTF-Blender-Exporter

FBX & Collada

assimp ( collada: animations yes, fbx: animations yes (with some limitations regarding file version, if fails, try autodesk converter to change version, converter is here: https://www.autodesk.com/developer-n...erter-archives ) )
https://github.com/assimp/assimp/blo...scal/Readme.md ( a 2012 version but has 2016 updates, no clear information how to build a dll / so library, no examples )
https://github.com/assimp/assimp/wik...knowledge-base
has a model viewer: http://cms.assimp.org/index.php/viewer - it can help see if your files will work with your project

X3D (animations: yes), MD3, COLLADA (animations: ? ):
Castle engine: https://github.com/castle-engine - https://castle-engine.io/features.php#section_data / https://castle-engine.io/vrml_x3d.php
- from castle engine: https://castle-engine.io/view3dscene.php

File formats:
DCal3D "Cal3D" part of jedi - https://master.dl.sourceforge.net/pr...JEDI-SDLv1.zip
loads DCal3D files (at least it claims to do so), but you will find it hard to find a good working blender or 3dsmax exporter.

half-life 2 smd:
tripledashgarlic: http://www.igrodel.ru/ - custom written animation loader, loads half-life 2 smd files.
glscene: https://sourceforge.net/p/glscene/co...es/GLSceneLCL/ / https://sourceforge.net/p/glscene/co.../GLFileSMD.pas
glscene supposedly also has md5 support (verify claim that md5 is supported in glscene !! ):

totally custom:
3d studio max 7 script exporter to custom file format - complete implementation http://xproger.mentalx.org/export_anim.html
It seems like a pretty clear case that going for modern GLTF by bero would most likely work best for skeleton animation needs, assimp would be 2nd best choice (provided that library works, it has zero examples).