These are just two of many mod packages out there. This mod pack is currently available so you can, from those locations, grab the files and try it out for yourself. Learn more about that project over here on their DCS World forum thread or on the Codename Flanker Discord. Their efforts have been aimed at bringing a reasonably realistic Su-30 Flanker variant to the sim complete with a custom cockpit, custom HUD symbology, avionics and an EFM (extended flight model) that incorporates fly-by-wire technology. DCS World already has a couple of Flanker variants but it doesn’t have the Su-30 and that (together with the Su-35 planned for a later date) is the focus of a mod team called Codename Flanker.