Kalpurush is a free Unicode based Bengali font. It is developed under Avro Font Development Project (http://www.omicronlab.com). It focuses both for printing and displaying on screen.
Latin typefaces are from Gentium (http://scripts.sil.org/cms/scripts/page.php?item_id=Gentium). Gentium is a trademark of SIL International.
This font is regularly maintained with Unicode updates and bug fixes.
This Font Software is licensed under the SIL Open Font License, Version 1.0. No modification of the license is permitted, only verbatim copy is allowed. This license is copied below, and is also available with a FAQ at: http://scripts.sil.org/OFL

Contact
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Tanbin Islam Siyam
siyam@omicronlab.com

Links
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https://github.com/potasiyam/Kalpurush
http://www.omicronlab.com/bangla-fonts.html