Here is a list, with links embedded, to Catholic websites (and a few interesting non-Catholic sites). The information on the Catholic sites appears to be faithful to Church teaching and worth checking out.  Any opinions expressed are their own.  

• Archdiocese of Ottawa-Cornwall

• Canadian Conference of Catholic Bishops (CCCB)

• Vatican

• Capturing Christianity videos

• Catholic Answers & videos

• Catholic Bridge

• How to Be a Christian videos

• Jimmy Akin

• Peter Kreeft

• St. Charles Borromeo Church Apologetics

• The Counsel of Trent videos

• The Complete Bible (Revised Standard Version, Catholic Edition)

• Agape Catholic Bible Study

• Bible Project (Protestant site)

• St. Charles Borromeo Church Bible Study (based on Sunday readings)

• St. Paul Center (Scott Hahn)

• The Bible in a Year podcasts with Fr. Mike Schmitz

• The Bible in a Year website with Fr. Mike Schmitz

• Understanding the Scriptures Podcasts

• Beginning Catholic

• Catechism of the Catholic Church (CCC)

• CCC – Simplified

• Compendium of the CCC (Q&A version)

• My Catholic Life (RCIA)

• The Catechism in a Year podcasts (Fr. Mike Schmitz)

• YouCat (Youth Catechism, pdf version)

• Catholic Icing

• Catholic Kids 101

• Catholic Kids Media (prayer & liturgy)

• Teaching Catholic Kids

• Catholic Online School

• Catholic Studies Academy

• Dr. Matthew Tsakanikas (Christendom College professor online course)

• Institute of Catholic Culture

• St Paul Centre (Scott Hahn)

• Catholic Concern for Animals

• Catholic Ecology

• Creatio

• Eco-Catholic

• Catholic Mom

• Catholic Parents

• Decent Films (reviews)

• Integrated Catholic

• NaProTechnology (for infertility)

• Natural Family Planning

• For Your Marriage

• Strong Catholic Family Faith

• To Jesus Sincerely

• Brief History of the Papacy (Part 1, 2, 3) videos

• Christ: The Center of History (free online course)

• Church History (video)

• Deep in History

• History for Atheists (author is atheist but refutes the “New Atheists” historical claims)

• Milestones of the Catholic Church (18th,19th, 20th centuries) videos

• Brian Holdsworth videos

• Catholic Education Resource Center

• Catholic Voices

• Catholic World Report

• Shameless Popery

• Aleteia

• Catholic Exchange

• Saint of the Day

• Saint of the Week

• The Catholic Me

• 10 Catholic/Christian Dating Sites

• Catholic Gentleman

• Catholic Match

• Catholic Singles

• FemCatholic

• Roman Catholic Man

• The Catholic Woman

• The Young Catholic Woman

• Those Catholic Men

• Online Dating Safety Guide

• Catholic Documentaries

• Catholic Movies

• Catholic Saints Movies

• Life is Worth Living television episodes, Bishop Fulton Sheen

• St Paul Centre

• The Chosen series (Ecumenical)

• Upon Friar Review

• Catholics Come Home

• Coming Home Network

• Fr. Mike Schmidt Videos

• Renewal Ministries videos

• Word on Fire & Bishop Robert Barron videos 

• CNA (Catholic News Agency)

• CNS (Catholic News Service) & videos

• The Catholic Register (Toronto)

• National Catholic Register (American)

• Zenit

• Action Life

• Birthright Ottawa

• Campaign Life Coalition

• Euthanasia Prevention Coalition

• Lifeissues.net

• Physicians for Life

• Priests for Life, Canada

• Catholic Dictionary

• Catholic Encyclopedia (1912)

• New Catholic Encyclopedia (2003, pdf)

• Courage International

• Eden Invitation

• Overcome

• Spiritual Friendship

• Aquinas 101

• CatholicScience.com

• Magis Center (Fr. Robert Spitzer)

• Society of Catholic Scientists

• List of Catholic clergy scientists

• List of Catholic lay scientists

• Ask Christopher West podcasts
• Theology of the Body Institute videos

• ​A Guide to Psychology & Its Practice

• Catholic Counselors

• CatholicPsych (free & pay)

• Come Aside

• David Torkington

• Hallowed app (pay)

• Souls & Hearts

• Spiritual Direction

• Upper Room Home of Prayer – located in Ottawa

• Busted Halo

• Breaking in the Habit

• Catholic Central videos

• Catholic Christian Outreach (CCO)

• ChurchPop

• Focus Catholic videos

• Jesus Youth

• Life Teen

• Real Life Catholic (free & pay)

• Catholic TV

• Catholic Radio Network

• EWTN

• Fully Catholic Radio

• Life is Worth Living, podcasts (Bishop Fulton Sheen)

• Relevant Radio

• Salt & Light

• Edward Feser

• Philosophy for the People videos

• The reproach of Christ

• The Thomistic Institute videos

• Reason & Theology videos

• ​Madonna House (lay community)

• Vocations.ca

• Canon Law Made Easy

• Catholic Digest

• Catholic.net

• Catholic Resources for Bible, Liturgy, Art and Theology

• Clarifying Catholicism

• Keep Your Faith videos

• Pints With Aquinas videos

• Simply Catholic

• The Catholic Thing

• The Catholic Traveler

• The Prodigal Catholic