IBM and PGP Corporation have each donated about £25,000 towards the efforts of saving the National Museum of Computing at Bletchley Park.
The museum is home to a large collection of working computers, including Colossus, the world's first programmable electronic computer.
Bletchley Park is a heritage site with exhibitions and activities based on Britain's code-breaking efforts during World War II.
But it has been denied public funding and the museum is now falling into disrepair. A dedicated website to collect public and industry donations for Bletchley has now been established.