Ludwig van Beethoven (1770-1827)
He began his musician life by studying the organ ...
There are some scores written for the organ: preludes, fugues, trios and some pieces for mechanical clock-organ ...
Some instrumental pieces can be adapted and played on the organ with happiness.
For the catalog of Beethoven's works, there are several classification systems: Opus - WoO - Hess - (and others)
Original score in the IMLSP library
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Here is the:
Romanze 2 in F (Adagio Cantabile op.50)
adaptation for the organ by A.V. Vliet
revisited by Jean-Pierre Silvestre
for Buckow-Rieger Organ from Komarom
Version 2