Hello Mahadevan sir,

Happy to see your interest in Tamil wikisource projects. For typing in tamil in tamil wikisource there is no need to install any softwares. We can enable the input methods provided in wiki and type in Tamil. we can choose the keyboard layouts we wish and use them. For detailed explanation please visit https://ta.wikisource.org/s/3tqe this page for help. If still find it difficult please let us know.

Regards,

J. Balaji