1
How DNSSEC Works
howdnssec.worksAlso covers security · same kind of website
How DNSSEC Works explains DNS Security Extensions through an illustrated guide to its purpose and operation.
Alternatives
The Best Hackers101 Alternatives in 2026
15 alternatives0 free · 1 open source
Looking for something like Hackers101? Here are 15 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 1 are open source.
About Hackers101hacker101.com
VisitHacker101 offers a free web security class with lessons and Capture the Flag challenges.
Top picks at a glance
First suggestionHow DNSSEC WorksHow DNSSEC Works explains DNS Security Extensions through…Open source optionReverse-EngineeringThis tutorial covers reverse engineering across x86, x64…Another optionProfessorMesserProfessor Messer offers free video training, study notes…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | How DNSSEC Works | — | Not stated | Web |
| 2 | ProfessorMesser | — | Not stated | Web |
| 3 | Juice Shop | — | Not stated | Web |
| 4 | PortSwigger Academy | — | Not stated | Web |
| 5 | Reverse Engineering Academy | — | Not stated | Web |
| 6 | BlueTeam Tools | — | Not stated | — |
| 7 | CrypTool | — | Not stated | Web, Windows |
| 8 | echoCTF.RED | — | Not stated | Web |
| 9 | How DNS Works | — | Not stated | Web |
| 10 | TryHackMe | — | Not stated | Web |
All Hackers101 alternatives
2
ProfessorMesser
professormesser.comAlso covers security · same kind of website
Professor Messer offers free video training, study notes, and study group replays for CompTIA A+, Network+, and Security+.
3
Juice Shop
owasp.org/www-project-juice-shopAlso covers security · same kind of website
OWASP Juice Shop is an intentionally insecure web application for security training, awareness demonstrations, CTFs, and tool testing.
4
PortSwigger Academy
portswigger.net/web-securityAlso covers security · same kind of website
PortSwigger Web Security Academy offers free online training and interactive labs for web application security.
5
Reverse Engineering Academy
reverseengineering.vercel.appAlso covers security · same kind of website
Reverse Engineering Academy covers fundamentals of reverse engineering, binary analysis, and software security.
6
BlueTeam Tools
github.com/A-poc/BlueTeam-ToolsAlso covers security
BlueTeam Tools collects tools and techniques for blue team security and incident response.
7
CrypTool
cryptool.orgAlso covers security · same kind of website
CrypTool provides online cryptology tools and links to documentation, education, and books.
8
echoCTF.RED
echoctf.redAlso covers security · same kind of website
echoCTF.RED provides offensive and defensive cybersecurity training labs and community access.
9
How DNS Works
howdns.worksAlso covers security · same kind of website
How DNS Works explains the Domain Name System through an illustrated guide, with updates and history.
10
TryHackMe
tryhackme.comAlso covers security · same kind of website
TryHackMe offers browser-based cybersecurity learning through hands-on labs and exercises for different skill levels.
11
CTF101
ctf101.orgSame kind of website
The CTF101 wiki introduces Capture the Flag competitions and explains related security concepts.
12
CTF Sites
ctfsites.github.ioSame kind of website
CTF Sites lists Capture the Flag sites and provides a directory for finding cybersecurity challenges.
13
Also covers security · open source
This tutorial covers reverse engineering across x86, x64, ARM, AVR, and RISC-V processor architectures.
14
CTFtime
ctftime.orgSame kind of website
CTFtime lists upcoming and past Capture the Flag events, teams, tasks, ratings, and writeups.
15
HackTheBox
hackthebox.comSame kind of website
Hack The Box provides cyber readiness training and security challenges for teams.
No alternatives match this filter.
Alternatives to similar tools
BlueTeam Tools15 alternativesPortSwigger Academy24 alternativesReverse Engineering Academy20 alternativesProfessorMesser24 alternativesHow DNSSEC Works14 alternativesJuice Shop13 alternatives
What is the best alternative to Hackers101?
Based on features, tags and platforms, the closest alternatives to Hackers101 are How DNSSEC Works, ProfessorMesser, and Juice Shop.
Are there open-source alternatives to Hackers101?
Yes: Reverse-Engineering.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative