This compilation from the manifestos shows the positions of the seven national parties recognised by the Election Commission of India on major policy issues. Instead of a manifesto, the Bahujan Samaj Party issued an Appeal to voters. There are similarities, but enough variations in the policy positions to suggest that ideological differences play a significant role.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/manifesto-watch-parties-and-promises
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/economy
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/economic-development
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industry
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/education
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/political-parties