Since, I have Paint Tool Sai & Photoshop CS6 downloaded for free I'll be testing Silky Shark on both of them for you all to see for yourselves. the pen tool (CLIP STUDIO PAINT details, Corel PaintShop Pro details). Price - 15-day trial, 35.00 to purchase Systems - Windows XP/Vista/7/8.1/10 Official website - Art Tool - Mouse and graphics tablet line smoother that needs to hook the art program to work (it does not overtake the system controls). I do believe Silky Shark is compatible with any free art program such as Paint Tool Sai, GIMP, Medibang, FireAlpaca, Adobe Flash 8 (for animation), & many other programs but, with little space left in my laptop storage I can only review very little. Of course there are others available too, but many are MS Paint clones or lack. Program - Lazy Nezumi Pro (Guillaume Stordeur) Tested version - v18.
Or draw a line hold the point in place and the line will straighten. You could also use the ruler to create a square. as well as Lazy Nezumi plugin all provide better smoothing experience. They work better with the fill tool than any of the brushes but at this point using the selection tool to create a square or circle would probably be your best bet. Other programs like paintool sai/ clip paint studio you name it. There is another alternative BUT, the downfall is that I don't have a Mac PC so I can't download it for you all sadly, one day I hope to download Lazy Nezumi Pro for it's helpful programmer seller cause, I think they deserve more love than hate, I mean $35 for a program isn't a bad price unlike *cough* Photoshop CS6 itself. You might be able to use the selection tool to create your shapes.
Like the title of this journal says it's a "free alternative" to Lazy Nezumi Pro for those who can't afford it like me, I'll be doing a YouTube video on how to download & Install it with no hassle. Here is the Blog that I found Silky Shark on The perspective match feature introduced in the previous update would sometimes fail to find a match, and send the center to infinity. So, earlier this morning I was searching for a free alternative to this program called "Lazy Nezumi" since I won't be able to get paid until at the end of the month I've decided to open up Art Commissions for my Undertale Chibi art, if anyone is interested?