Resources

See fpart(1) and fpsync(1) for more details.
Article about data migration using fpart and rsync (GNU Linux Magazine #164 - October 2013, french) : Parallélisez vos transferts de fichiers
Steve French mentioned fpart and fpsync at 2019 Linux Storage, Filesystem, and Memory-Management Summit (LSFMM)
The partition problem and bin packing problem descriptions on Wikipedia
I am sure you will also be interested in Packo which was developed by Jean-Baptiste Denis as the original proof of concept. See also his newer tool, Msrsync

Projects using fpart

Harry Mangalam, from UCI, has an excellent article about data transfer here. Check out his parsyncfp and parsyncfp2 tools.
Dave Altschuler wrote dsync, a tool using fpart + rsync or rclone that can sync to the cloud
K-rsync uses fpart and the kubernetes Job scheduler to transfer files between PVCs

Bioteam used fpart + fpsync + rsync to migrate 2 PB of data
FAS RC (Harvard University) writes about fpsync to move data on Harvard's Odyssey cluster
Standford University's Sherlock HPC cluster offers fpart as a file management tool
Nantes University's BiRD cluster provides a fpart module
Sweden's NSC (National Supercomputer Centre)'s Centre Storage suggests using fpsync
National Energy Research Scientific Computing Center (NERSC) writes about fpsync
Fpart is proudly referenced in the French Government's 'SILL'

Intel has written a white paper about data migration, presenting fpart and fpsync
Amazon uses fpart and fpsync in their EFS-to-EFS backup solution. See also their Amazon Elastic File System (Amazon EFS) for File Storage presentation (AWS Storage Days, New York, September 6-8, 2017) and the Amazon EFS performance tutorial, both presenting fpart and fpsync capabilities
Microsoft suggests using fpart and fpsync to speed-up file transfers
Alibaba (Aliyun)
Oracle
cunoFS
Nutanix
Huawei Latin America cloud