LibreOffice - Free office suite, open source, and compatible with .doc, .docx, .xls, .xlsx, .ppt, .pptx files. Updated regularly – download for free. Originally based on OpenOffice.org.
Hellofax - Easy. Reliable. Online faxing. Send & receive faxes from anywhere.
ONLYOFFICE - ONLYOFFICE is a complete office and productivity suite.
RingCentral Fax - RingCentral Fax is an online fax solution that enables companies to avoid the bulkiness of paperwork and maintenance costs of fax machines and charges of phone lines.
Apache OpenOffice - Apache OpenOffice is an open source, office document productivity suite.
mFax - mFax is a cloud-based fax solution for sending and receiving faxes from any device.