I have found the following active centres for business incubation in india.For a detailed note  on the companies incubated read the comment following. 

1)NS Raghvan Cenre learning (www.nsrcel.com ) IIM Bangalore

2)Nirma Labs (www.nirmalabs.com) Nirma University Ahmedabad

3) Tie EAP (www.tiebangalore.org/eap_home.html ) Bangalore

4)SINE -IIT Bombay ( www.sineiitb.org ) Bombay

 Travel Technology Companies in India

1.Final Quadrant- (www.finalquadrant.com )Noida

2.Quad Labs-(www.quadlabs.com )Noida

3.Tekriti Software (www.tekritisoftware.com) Gurgaon

4.Verchaska Infotech (www.verchaska.com )Mumbai

5.Kale Consultants (www.kaleconsultants.com ) Pune

6.Value Labs (www.valuelabs.com) Hyderabad

7.Influence Software Group (www.ezeetours.com) Delhi

8.TI Infotech (www.tiinfotech.com) South Delhi

9.Xyka ( www.xyka.com ) Bangalore

10.Le Travenues (www.travenues.com) Gurgaon ,IXIGO

GDS distributors in India

1.Interglobe ,IGT (www.interglobe.com ) Delhi -Distribution of Galileo

2.Calleo  (www.worldspanindia.com ) Delhi-Distribution of Worldspan

3.Amadeus (www.amadeus.com)

4.Abacus (www.abacus.com)

Payment Gateway in India

1. UTI Bank (www.utibank.com)

2 ICICI Bank (www.payseal.com)

3.HDFC BANK (www.hdfcbank.com)

4.Billdesk (www.billdesk.com)

5.CCAvenue (www.ccavenue.com)

6.Itzcash (www.itzcash.com ) Mumbai

7.Done Card (www.donecard.com) Mumbai

8.Paymate Mobile Payment gateway (www.paymate.co.in) Mumbai

Sr.Nr.
 Category Sites
1 Automobiles Carwale,Infibeam,Indimoto (classifieds)
2 DVD Seventymm,Clickflix,Madhouse

3 E-learning Techbirbal,24*7guru
4 Search engine/Directories Guruji,raftaar,Asklaila,Justdial,Sulekha(directory)
5 Social Networking Burrp,Tolmolbol,Minglebox,Yaari,IBIBO,Bigadda.com,indyarocks
Demartini,Indiahappening(blog),
6 Professional Networking Linkedzone
7 Online Photo Printing ITasveer,merasnaps,picsquare,
8 Video Sharing Dekhona,Apna Tube
9 Travel Portal Makemytrip,Yatra Travelguru Cleartrip,flightraja,abhibus.in,redbus.in,
Reachgujarat,Customerseva,traveldunia
 Zoomtra,Ixigo (searchengine)
10 Recruitment Techtribe,Babajob.com,Bixee.com (searchengine),Gladoo.com
11 Internet
Security Cybersecurityinc
12 Technology ZDNet India,ITVidya
13 Shopping Indiaplaza,Offerforshoppers,Dealmaadi,Futurebazaar
14 Classifieds Indimoto*,Sulekha*,metromela,Indialist (craiglist of India),
Indiapages (searchengine)We-exchange
15 Music Beatofindia,,Desihits
16 Bollywood Santabanta,Bollywoodworld,Ebolly,teenstation
17 Events SERaja,eventsofindia,ilaaka
18 Traveling directions Routeguru,commuteeasy
19 Consumer Research Mouthshut,Spoteazy
20 Mobile Payment Paymate,mchek
21 Merchandising Dilsebol,Eyantra ,myntra
22 Tech Product Webaroo
23 Cinema Ticket Booking Bookeazy.com
24 Mobile Search Onyomo.com
25 Personal Finance Stockhive,Way2wealth Moneycontrol
26 Others Humdigg (social bookmarking),dwaar
27 Groups People Interactive Group,Times Internet ,WEB 18,Sify
Reliance ,Rediff,Infoedge