Sachin Tendulkar has always been a gentleman, on field or off field and has contributed to the society outside the cricketing world.
Now charity is 'optional' for cricketers but it does show the amount of care a person has for the society. Sachin Tendulkar has been sincerely involved in many activities of philanthropy during his career. Here are a few I came across. Do let me know if you find more and I will add to this list :
1) He sponsors 200 underprivileged children every year through an called Apnalaya, He sponsors for all their basic needs like clothes and for their education,books etc.
2)Tendulkar has helped over 300 patients through the Dr Agarwal Eye Hospital in Chennai since October 2004 by helping them get their cataract and eye grafting operations done.
3) Tendulkar has been instrumental in the hospital taking care of total expenses for treatment of state level sportsmen and women.
4) Sachin helped a telethon raise Rs7 crore for schools( 2 crores more than the target).He devoted all of nine hours to the 12-hour Coca-Cola-NDTV Support My School telethon, patiently answering questions from schoolchildren.
Source : http://www.dnaindia.com/sport/report-humble-sachin-tendulkar-helps-telethon-raise-rs7-crore-for-schools-1589076
5) He also helped raise over Rs. 1 crore through a request on Twitter for a cancer charity through a post "Sachin's crusade against cancer".
6)Sachin paid the total expense of 'hip substitute' surgical treatment of Dalbir Singh Gill, a former cricketer who played with Sachin Tendulkar at Under-17 levels. When Dalbir’s mom wrote a letter and sent all health care reviews to Sachin, within hours he responded saying he would do all he could for his friend.
7)Sachin Tendulkar endorses social advertisements and various other consciousness campaign free of charge like Polio etc.
Sachin presented the donors with bats signed by himself and personally thanked them.
Source : http://www.breakingnewsonline.net/newswatch/2237-sachin-tendulkar-raises-rs-10-million-for-cancer-charity.html
Besides doing all these he also keeps himself busy with various other social issues, awareness campaign, charity work from time to time. The greatest player of cricket is a great human being too.