Getting a full record of accidents of the IAF and its earlier avatar RIAF is not possible from official documents. The results of enquiries rarely make it to the press. However, newspaper reports have been compiled into this resource: http://www.warbirdsofindia.com/crashes.html . It stops at end-2008, but aviation-safety.net more or less lists everything after that. However, the Warbirds data has been updated up to 2013 and can now be seen at http://www.bharat-rakshak.com/IAF/Databases/Accidents.html . Apart from the IAF, there are a sizable number of aircraft operated by the Navy and smaller numbers by the Army, Coast Guard and the top-secret Aviation Research Centre. (But then, many top-secret organizations have articles about them in Wikipedia).
Regarding civilian crashes (Passenger and freight airline flights, general aviation, some government and paramilitary aircraft) we have the DGCA which investigates them and there is some record of the enquiries. They also cover accidents to foreign aircraft occurring in India from the 1960s onwards. Conversely, accidents to Indian aircraft outside India are generally investigated by the country where the crash occurred, though Indian authorities are involved.
To see accident summaries, click on http://www.dgca.in , then on Aircraft and then on Summaries. These are mainly in pdf form from 1960 to 2009. There must have been summaries from 1950 to 1959 as well. but they are not on the net.
More detailed accident reports from 2008 can be seen by clicking Reports rather than Summaries.
Coming back to the summaries, they give the very bare details and the inquiry reports may not have been released to the public. Perhaps RTI applications would help if one was really interested. Anyway, here are a few accidents which would be of interest:
19 Sep 1965, Expeditor VT-COO which was the plane carrying the Gujarat CM Balwantrai Mehta which was shot down in the course of the Pakistan war. (This has received a lot of coverage in the news media in the last few years)
23 Jun 1980, Pitts S-2A VT-EGN in which Sanjai Gandhi and another was killed.
26 Apr 1979, Indian Airlines Boeing 737 VT-ECR near Chennai. Fortunately no one was killed or badly injured, but it was clearly a terrorist bomb. There does not seem to have been any subsequent report as to who was responsible.
In closing: there is no single book or online resource which gives a listing and details of aviation accidents in India and involving Indian aircraft. Perhaps it is time someone wrote such a book. Watch this space.
Next, I will provide a list of all Indian or India-connected aviation disasters in which 30 or more persons were killed. This list does not appear anywhere else on the net or in any publication.