NOTE: This list is by no means complete, and will be updated as other opportunities come to attention.
- Abbott Laboratories
- Allstate Insurances
- Caterpillar
- Cisco Systems
- Compaq
- Computer Associates
- Dell
- Digital Equipment Corporation
- Eli Lilly Ford Internship Program
- Hewlett Packard
- Intel
- Lucent Technologies
- Microsoft
- Motorola
- Netscape
- Novell
- Oracle
- Principal Financial Group
- Progressive Insurance
- S.C. Johnson Wax
- Silicon Graphics
- State Farm Insurance
- Sun Microsystems
Research Labs
- DIMACS Research Experience for Undergraduates
- Hope College Summer Undergraduate Research Program
- Oak Ridge Institute for Science and Education
- University of Alabama Computer Science REU Program
- University of Iowa Research Experience for Undergraduates
Opportunities for Women and Minorities
- CRA Distributed Mentor Project for Undergraduate Women
- National High Magnetic Field Laboratory Internship
Other lists
Career Services also maintains a list of companies that offer internships in the summer.
ACM (Association for Computing Machinery) also maintains a list of internship opportunities for students.