Merck: The Merck Company Foundation will contribute $3 million (upped from an earlier pledge of $250,000) to the American Red Cross, the U.S. fund for UNICEF and local South Asian organizations. Merck says it will also donate products to the region. Finally, the company will set up a matching program for employee contributions to the relief effort.
Novartis: The company says its South Asian affiliates are providing water and medications locally. It has not yet determined whether it will make a larger-scale donation.
Pfizer: Pfizer announced it is giving $10 million in cash to relief organizations including the American Red Cross/International Red Cross and Red Crescent Societies, International Rescue Committee, Catholic Relief Services, CARE, UNICEF and Save the Children as well as local relief organizations. The company will also provide $25 million in medical aid, including anti-infective products like Zithromax, Zyvox and Diflucan.
AOL: On the AOL welcome screen for its 29 million worldwide members is an area where AOL is encouraging members to donate. This site is called the "Network for Good" and is the umbrella organization set up for relief charities. As a corporation, AOL is making a $200,000 donation for relief efforts to the American Red Cross. Finally, the companies will match employee donations, dollar-for-dollar for a maximum of $50,000.
Amazon.com: On its homepage is a link for people to donate to the American Red Cross. As of Jan. 4, more than $14 million had been raised through more than 172,000 separate donations. By way of comparison, Amazon.com did the same thing after 9/11 and raised about $6.8 million.
IBM: Donating $1 million and deploying crisis response teams in Indonesia, India and Thailand to install hardware and software at crisis centers.
Bill and Melinda Gates Foundation: The foundation has reportedly pledged $3 million to NGOs.
Medtronic Donating $200,000 and earmarking part of a three-year deal with the Red Cross for tsunami relief.
Microsoft CP: Donating $3.5 million -- $2 million from the corporation and an additional $1.5 million from matched employee contributions to date. Offices in South Asia are also involved in local relief efforts.
Qualcomm: Donating $1 million
BellSouth: Donating $1.2 million, including $1 million from an employee matching program.
Sprint: Sprint says it currently supports the Red Cross with phones and calling cards.
US Cellular: The company is matching employee donations and in discussions with the Cellular Telecommunications & Internet Association to determine whether it should make a large-scale monetary donation.
Verizon: Donating $1 million, including $900,000 from the employee match program and the initial $100,000 donation. The employee match program continues through the end of January.
Comcast: Contributing $100,000 cash and an additional $10 million in-kind donations, including advertising for relief agencies.
MTV: MTV has been showing relief organization information on its HDTV screen in Times Square, and during its New Year's Eve coverage the music channel broadcast information about relief efforts by the Red Cross including an appeal by the rock band Linkin Park.
Time Warner: Donation $1.2 million and organized a matching grant program for employees. AOL has also been soliciting donations through its welcome screen.
ABC News' Charles Herman, Dan Arnall, Roger Sergel and Sheila Marikar contributed to this report.