On these websites below, you may find tracts and booklets that you may use to witness or share the gospel with Catholics.

Tracts and Booklets

Christian Witness to Roman Catholicism (CWRC)
http://www.cwrc-rz.org/store.html
http://www.cwrc-rz.org

ExCatholic Baptist.org
http://www.excatholicbaptist.org/?page_id=146
http://www.excatholicbaptist.org

Gospel Outreach International (GOITRC)
http://www.goitrc.org/store.html#booklets
http://www.goitrc.org

James G. McCarthy
http://jamesgmccarthy.com/store_referenceguide.shtml
http://jamesgmccarthy.com/store.shtml
What You Need to Know About Roman Catholicism: Quick Reference Guide

Literature Ministries International
http://www.litmin.org/store/products.php?catid=2&do=list
http://www.litmin.org/

The Berean Call (TBC) Store
https://thebereancall.com/search?q=booklets
https://thebereancall.com

Chick Publications
http://www.chick.com/catalog/tractByKeyword.asp?Subject=Catholicism
http://www.chick.com
This place has tracts or booklets.

ExCatholic Baptist.org
http://www.excatholicbaptist.org/?page_id=146
http://www.excatholicbaptist.org

Fellowship Tract League
http://fellowshiptractleague.org/tract_languages.html
http://fellowshiptractleague.org

First Bible Church
http://www.firstbible.org/resources/tracts.html
http://www.firstbible.org

Free Christian Tracts
http://freechristiantracts.info

Gospel Outreach International (GOITRC)
http://www.goitrc.org/store.html#tracts
http://www.goitrc.org

Mission to Catholics
http://www.mtc.org/mtc_trax.html
http://www.mtc.org

Proclaiming the Gospel

Roman Catholicism: Scripture vs. Tradition
https://www.proclaimingthegospel.org/site/cpage.asp?sec_id=180014816&cpage_id=180064909#!/Roman-Catholicism-Scripture-vs-Tradition/p/2500111
https://www.proclaimingthegospel.org

Roman Catholicism: Scripture vs. Tradition Spanish
https://www.proclaimingthegospel.org/site/cpage.asp?sec_id=180014816&cpage_id=180064909#!/Roman-Catholicism-Scripture-vs-Tradition-Spanish/p/108102020
https://www.proclaimingthegospel.org

Rome Vs The Bible
https://www.proclaimingthegospel.org/site/cpage.asp?sec_id=180014816&cpage_id=180064909#!/Rome-Vs-The-Bible/p/2500112
https://www.proclaimingthegospel.org

The Supreme Authority for Truth and True Faith or False Hope
https://www.proclaimingthegospel.org/site/cpage.asp?sec_id=180014816&cpage_id=180064909#!/The-Supreme-Authority-for-Truth-and-True-Faith-or-False-Hope/p/54471833
https://www.proclaimingthegospel.org

tracts4u.org
http://www.tracts4u.org/item_home_tract003_191
http://www.tracts4u.org
You may download the tracts for free as pdfs.

Which Jesus Will You Trust
https://www.proclaimingthegospel.org/site/cpage.asp?sec_id=180014816&cpage_id=180064909#!/Which-Jesus-Will-You-Trust/p/2500114
https://www.proclaimingthegospel.org

The Berean Call (TBC) Store
https://thebereancall.com/search?q=tracts
https://thebereancall.com