I recently started The Bestiary Blog, a resource that might be particularly useful to Starfinder GMs because so far Starfinder has been its focus. I've been adapting a lot of creatures from Pathfinder to Starfinder, as well as making some original monsters, for one of my homebrew games, and I decided to share this with the community. One of my goals for the blog is to convert a lot of the classic D&D monsters to Starfinder. The chimera (and its cousin the mecha-chimera) was my first posted conversion, but I've since done manticores, kobolds, ape-men (my only "original" monster so far, that is to say my only monster that I don't think has a direct analogue in Pathfinder), and dire rats. I have a lot to come, and I hope you guys check it out. Feel free to give feedback on any aspect of the project, as well as suggestions for conversions or original monsters.
I should also note, and this is the part that I'm perhaps most happy with, that I have also created sorted lists of all of the monsters already available in Starfinder, along with links, typically to the Starjammer SRD listing for the monster. The best part of this is that I made a list of monsters sorted by CR along with links, which I don't think exists anywhere else online (though I could be wrong). The list of monsters sorted by CR on starjammersrd.com doesn't have links. I've already been using this resource in my own games, and I hope you find use for it as well.