Here is a list of all documented files with brief descriptions:

tkrzw_cmd_util.h	Command-line utilities
tkrzw_compress.h	Data compression functions
tkrzw_containers.h	Miscellaneous data containers
tkrzw_dbm.h	Database manager interface
tkrzw_dbm_async.h	Asynchronous database manager adapter
tkrzw_dbm_baby.h	On-memory database manager implementations based on B+ tree
tkrzw_dbm_cache.h	On-memory database manager implementations with LRU deletion
tkrzw_dbm_common_impl.h	Common implementation components for database managers
tkrzw_dbm_hash.h	File database manager implementation based on hash table
tkrzw_dbm_hash_impl.h	Implementation components for the hash database manager
tkrzw_dbm_poly.h	Polymorphic database manager adapter
tkrzw_dbm_shard.h	Sharding database manager adapter
tkrzw_dbm_skip.h	File database manager implementation based on skip list
tkrzw_dbm_skip_impl.h	Implementation components for the skip database manager
tkrzw_dbm_std.h	On-memory database manager implementations with the C++ standard containers
tkrzw_dbm_tiny.h	On-memory database manager implementations based on hash table
tkrzw_dbm_tree.h	File database manager implementation based on B+ tree
tkrzw_dbm_tree_impl.h	Implementation components for the tree database manager
tkrzw_dbm_ulog.h	DBM update logger implementations
tkrzw_file.h	File interface
tkrzw_file_mmap.h	File implementations by memory mapping
tkrzw_file_poly.h	Polymorphic file adapter
tkrzw_file_pos.h	File implementations by positional access
tkrzw_file_std.h	File implementations by the C++ standard file stream
tkrzw_file_util.h	File system utilities
tkrzw_hash_util.h	Hash utilities
tkrzw_index.h	Secondary index implementations
tkrzw_key_comparators.h	Built-in comparators for record keys
tkrzw_langc.h	C language binding of Tkrzw
tkrzw_lib_common.h	Common library features
tkrzw_logger.h	Logger interface and implementations
tkrzw_message_queue.h	Message queue on the file stream
tkrzw_str_util.h	String utilities
tkrzw_thread_util.h	Threading utilities
tkrzw_time_util.h	Time utilities