osef.org

Osef.org enhances k-12 education with open source & free software.

History of the Open Source Education Foundation The founding members of The Open Source Education Foundation (OSEF) met while working at an elementary school in Tucson, Arizona.

Claim profile Full report Suggest official facts Visit website Claiming, verifying, and correcting is always free.

Authority

—/100

Safety

90/100

Registered

Feb 16, 2000

26 years old · CSL Computer Service Langenbach GmbH d/b/a joker.com

1 of 2 safety checks passed (Sep 18, 2026).

AboutUs has not vetted this site. 1 of 2 automated safety check did not pass. Everything below is what we could measure automatically. Anything you do on the site — paying, sharing personal details, downloading — is between you and the site, not AboutUs.

Current facts

Latest available measurements; dated entries retain their dates. These are measurements, not an endorsement of the site.

Authority & Safety, with the evidence

How this is scored →

Authority: not enough signals yetClear

Why we're not scoring this yet

We withhold an authority number until independent evidence (global rank, link-graph presence) has accrued. The facts we do have about this site are shown below — we'd rather say “not enough signals yet” than invent a low score.

Safety evidence

No unexpired threat-feed result; name-similarity check available (recorded about 31 days ago); 3/3 transport and email checks available (oldest recorded about 31 days ago). This is evidence coverage, not a probability that a website is safe.

Recorded HTTPS check did not confirm a valid connection
Missing DMARC (mild)

Site history

Dated record — historical facts always carry their date.

2000
Domain registered (Feb 16, 2000).
2026
Checked today — 1 of 2 safety checks passed (Sep 18, 2026).

✓ domain continuity 26 years registered✓ live verified Sep 18, 2026

Suggest official facts

Correct a description, link or other detail. Submissions are reviewed before publication.

Suggest official facts

Propose corrections now; verification still controls trusted owner status.

Drafts save only in this browser for up to 7 days.

Correction review promise

Official facts can help this public profile, but publication waits for moderation, evidence, and owner-proof gates.

Correction review promise: Every submitted official fact is saved for moderation before it can change the public profile.
Evidence before publication: Reviewers compare your official URL, evidence URL, and note against the visible report findings before accepting changes.
Owner proof before control: Unverified corrections can improve the report, but owner status, DNS control, and paid outcomes still require proof.
Secure same-site intake: AboutUs accepts this public correction only from AboutUs pages, keeps the response uncached, and rate-limits noisy requests.

NameEmail

RoleProposed titleProposed summaryCategoriesOfficial URLEvidence URLReview note

Keep a backup before submitting

View prepared text

Is this your website? Claim it free and put your brand at the top of this page — the record stays, and starts working for you.Claim this profile — free