Competitions:

1. Prize of the Beheaded Man by Paul Cooijmans: http://iq-tests-for-the-high-range.com/prize_behead.html 

2. World I.Q. Challenge by Brennan Martin: http://www.worldiqchallenge.com/ 

3. Aha! Puzzles Wizard Challenge by Lloyd King: http://www.ahapuzzles.com/contest.htm 

Recommended tests:

3. Three Sonnets by Heinrich Siemens: http://tweeback.com/hriq/Three-Sonnets.pdf

4. LDA-SWaN by Gianluigi Lombardi: https://ldaswantest.wixsite.com/iqtest

5. Labyrinthine LIMIT by Paul Cooijmans: http://iq-tests-for-the-high-range.com/labyrinthine_limit.html

6. Mathodica 22 by Mislav Predavec: http://news.generiq.net/Mathodica22/mathodica22.html

7. Verecenthon by Ivan Ivec: http://ivec.ultimaiq.net/vercent.htm

8. Challenger by Zoran Bijač: https://globeiq.net/challenger-2/

9. Human Intelligence Test by Brennan Martin: http://www.worldiqchallenge.com/human-intelligence-test.html

10. AGLT by Andre Gangvik: https://docs.wixstatic.com/ugd/50d047_c1b0f3a5ab6f4effb5442501bcfd69e4.pdf

11. VORTEX by Miroslav Radojević: https://iqexams.net/VORTEX/VORTEX_F_NUMLETT.pdf

12. TetrastIQ Light by Gabriel Garofalo: https://tetrastiqlight.weebly.com/

13. Tests by Randy Myers: https://i-qtest.com

14. Tests by Marco Falchi: httpshttps://marcotests.weebly.com/://marcotests.weebly.com/

IQ score listings:

GENIUS High IQ Network: http://www.geniusiqnetwork.org/scores

Gifted High IQ Network: http://www.giftediqnetwork.org/iq-scores

Global Genius Directory: https://geniusdirectory.org/

Hall of IQ scores: http://topiqscores.weebly.com/iq-scores.html

HRIQ Ranking List: http://rank.hriq.org/

High IQ Database: https://highiqcommunity.com/iq-scores/

Mahir Wu Ranking List: https://mahirwu.wixsite.com/iqtests/rank-1

VeNuS Ranking List: http://venushighiqsociety.org/index.php/members

World Famous IQ Scores: http://www.ultimaiq.net/list.html

World Genius Directory: http://psiq.org/home.html

World Genius Registry: https://worldgeniusregistry.org/

World Highest IQ Scores: http://scores.generiq.net/

World`s Highest IQ`s: https://worldgeniusdirectory.org/

GFIS IQ List: http://www.tlgstoh.com/forum.php?mod=viewthread&tid=420&extra=page%3D1

WIQF Listing: http://wiqf.org/wiqf-ranking/

Real IQ Listing: http://iq.ultimaiq.net/

Other interesting links:

Hiqora: http://www.hiqora.com/

GCHQ (Puzzle Championships, follow newsfeed for future events)

World Puzzle Federation: http://www.worldpuzzle.org/

Cryptography tools: http://www.dcode.fr/tools-list

Polymathica - Global community dedicated to intellectual sophistication

ZollyDarko - web-site for I.Q. testing: http://www.zollydarko.com/

IQ Analysis by Randy Myers: https://iqanalysis.net

Andrew Hayles`s website: https://www.andrewhayles.com/home

Indian High IQ Society: https://inhiqs.org

STAR Intellects High IQ Society: https://starintellects.org

High Range IQ tests by Nitish Joshi: https://njiqtests.weebly.com

CATHOLIQ - High I.Q. Society for Christians: http://catholiq.org/

On High-Ceiling Intelligence Tests by Christopher Michael Langan: http://web.archive.org/web/20020204083531/http://www.megasociety.net/HighCeiling.html

On using multiple tests for high IQ society admissions by Grady Towers: http://web.archive.org/web/19991009210101/http://www.eskimo.com:80/~miyaguch/grady/societies.html

“Just say no” to averaging IQ subtest scores byJoel Schneider and Kevin McGrew: http://www.iapsych.com/iapap101/iap10110.pdf

I.Q. test scores by country on tests by Paul Cooijmans: http://iq-tests-for-the-high-range.com/statistics/iq_by_country.html

Average I.Q values in various European countries by Vinko Buj: link

The Inappropriately Excluded by Michael W. Ferguson: http://polymatharchives.blogspot.hr/2015/01/the-inappropriately-excluded.html

Free Christian books: http://www.traditionalcatholic.co/free-catholicbooks/