Quality of the Both Paid and Unpaid Journals are good only. The think is timing
Very good article that talks about the differences of impact factor between specialities, which shows that the impact metric is a very skewed measure. It also de-bunks the myth that those who 'pay to publish' are producing inferior work. - Take time to read it :-)
In case of social sciences, the quality of the papers published in paid journals is extremely poor. An author should put the paper in dustbin instead of payment of the publication fee.
Why Isn't Academic Research Free to Everyone?
It does not matter if the journal has some impact factor or SCI.
Abul: Lots of funders demand that research is published in 'reputable journals', and some even state which level these have to be. It might not matter to us as individuals whether a journal has a high impact factor. For example, some of the scientific magazines or professional publications do not have an IF, but still have a huge readership. Personally, although I like to feel I value all forms of evidence, I am wary of journals that have no 'credential', when it comes to publishing primary research.
can any one suggest me about some unpaid journals for mathematics?
Åsa AB Fasth, Fast-Berglund
Chalmers University of Technology
University of Port Harcourt
Quan Hoang Duong
South East Asia Reseach Association of Viet Nam
Institute of Radio Astronomy NAS
Technische Universität Berlin
University of Campinas
Nicholas E Rowe
University of Lapland