Multilingual Qur'an  
Includes Arabic text, three searchable translations (M.H. Shakir, Abdullah Yusufali, Marmaduke Pickthall) and searchable English commentary by Agha Puya / Mir Ahmed Ali.
The Qur'an at USC    
Includes three translations side by side (M.H. Shakir, Abdullah Yusufali, Marmaduke Pickthall), a comprehensive search engine and topical index.