IslamicWeb.com offers you the best collection of Classical Islamic books Ummahat Al-Kutob along with full-length texts and short articles from a variety of contemporary and classical sources. Each text is easily searchable by submitting queries to a search engine attached to each major text.
The True Message of Jesus Christ A huge book by Dr. Bilal Philips
The status of women in Islam , by Jamal Badawi
Source Methodology in Islamic Jurisprudence (Usul Al-Fiqh Al-Islami) by Taha Jabir Al'Alwani
Kitab At-Tawhid: The book of monotheism, by Muhammad bin Abdul-Wahhab.
Clarification of the Doubts A Decisive Reply to the Doubts and Arguments of the Associationists
Aqeedatut-Tahaawiyyah This is what all Sunni Muslims (Salafis, Ash'aris, Matareedis) agree on
Principles of Islamic Faith (Al-`Aqidah Al-Wasitiyah) by Ibn Taymiyah
Kitaab-ul-Eemaan by the Imaam and mujtahid, Abu 'Ubayd al-Qaasim ibn Salaam (d.224H)
The Concise Legacy by Ibn Taymiyyah
An Introduction to the Science of Hadith by Suhaib Hassan
The Fundamentals of Tawheed (Islamic Monotheism) by Abu Ameenah Bilal Philips