Linked from
The 11 pages that link to Roche-lobe overflow, each with the reason it gives.
X-ray binaryRelated: A companion can feed the compact object when it fills its Roche lobe.
Millisecond pulsarRelated: It can feed the accretion that spins up a millisecond pulsar.
Scorpius X-1Related: This process is thought to feed matter from the companion into Scorpius X-1.
X-ray pulsarRelated: It can feed an accreting neutron star in a close X-ray binary.