Newest releases:

Core library	2.3.3
AdPlug/Winamp	1.8.2
AdPlay/DOS	1.6a
AdPlay/UNIX	1.8.1
AdPlug/XMMS	1.2
libbinio	1.5

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AdLib file formats reference library entry:

Legend:

A: The file format is already (partly) supported by AdPlug.
D: File format documentation/specification is available.
E: Editor software is available.
P: Player software is available.
M: Test music files are available.
S: Source code is available.

HSC - Hannes Seifert Compositioni (?)

.HSC

A DEPM

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This format originates with developer Hannes Seifert while he worked at Neo Software Productions GmbH. The player has been decompiled and reworked multiple times by various groups, so there exists multiple trackers and playback engines with various inheritance.

Wikipedia Rockstar Vienna (former Neo Software Produktions GmbH)
libxmp writeup on hsc
vgmpf.com HSC
modland.com music archive
modland.com tracker archive
modland.com player archive #1
1 modland.com player archive #2