German Language Practice

Play famous chess games from their critical position against a friend, a rated opponent or Stockfish in your browser. 50+ legends, 3,600+ openings, divergence report. Free, open source (MIT).

Cold email software built for scale — connect unlimited sending accounts, automate warmup, and manage all replies from one unified inbox.

Learn Vietnamese online with vetted native tutors — personalized 1-on-1 lessons from $10, a free 30-minute intro, and flexible subscriptions.

CardShare.ai combines AI-generated cover art and message drafts with single-link signature collection, offering free group greeting cards and a Slack app for team workflows.

Share passwords, API keys and confidential notes with zero-knowledge end-to-end encryption, self-destructing links and no ads or trackers.

Interview Practice lets you rehearse behavioral interview answers out loud on a timer — then an AI mock built from your resume and the job description scores each answer and shows what a stronger one looks like.