https://whiteboard.explaineverything.com/
https://www.softandapps.info/2019/05/14/youconvertit-conversor-online-para-todo-tipo-de-archivos/
https://www.softandapps.info/2016/06/02/online-convert-conversor-online-todo-tipo-archivos/
https://dictation.io/speech (chrome)
https://tools.pdf24.org/es/creator
https://www.pdfforge.org/online/en
para descargar:
https://products.aspose.app/pdf/family
https://www.softandapps.info/2016/02/05/online-ocr-extrae-el-texto-de-documentos-pdf-e-imagenes/
https://www.softandapps.info/2017/07/11/generador-de-graficos-online/
https://livegap.com/charts/?lan=es
https://framalibre.org/content/typst
https://www.daypo.com/crear.php
https://pregunta2.com/crear/test-conocimiento
https://framaforms.org/abc/es/
https://alternativeto.net/software/google-forms/?license=opensource
https://ec.europa.eu/eusurvey/?language=es
https://alternativeto.net/software/php-formbuilder/about/