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1. 
   Goldendict

   GoldenDict is a free, feature-rich dictionary lookup program. It supports multiple dictionary file formats, renders articles with complete markup, illustrations, and retained content, and allows word input without accents or correct case. It uses WebKit for accurate article representation, supports Wikipedia, Wiktionary, and other MediaWiki-based sites, can use arbitrary websites as dictionaries, and includes Hunspell-based morphology for stemming and spelling suggestions. Additional features include scan popup, global hotkeys, tabbed browsing, cross-platform support for Linux/X11 and Windows, and it is licensed under GNU GPLv3+.

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   Numla

   Numla provides educational videos, lessons, tutorials, or self-learning resources.

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3. 
   NotebookCast

   NotebookCast is a free online collaborative whiteboard that does not require signup to start using. It supports real-time multi-user drawing, includes built-in time-unlimited audio and video calls, and provides tools such as shape drawing, sticky notes, text editing, and screen sharing. Users can create reusable whiteboard templates, access night mode, and share whiteboards via links. A free registered account allows saving whiteboards to a personal dashboard, and the tool works on any modern browser.

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4. 
   Flashka

   Flashka is an AI-powered study application that transforms user-uploaded notes, PDFs, lecture slides, and recorded audio into learning materials. Its features include AI-generated flashcards, spaced repetition scheduling, quizzes, mock exams, study plans, lecture transcription, mind maps, oral exam practice, case studies, and image occlusion tools. An integrated AI tutor provides support, and users can request material edits via an in-app chat.

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5. 
   Fraze.it

   Fraze.it is a multi-language resource for improving writing skills. It supports English, French, Spanish, German, Italian and Portugese, and offers access to more than 100 million daily use sentences. The platform serves professional writers, college students, ESL students and teachers, and provides tools to search for sentences with filters including interrogative structure, sentence start/end terms, famous quotes and present perfect tense examples.

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6. 
   Cheatography

   Cheatography provides educational videos, lessons, tutorials, or self-learning resources.

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