Form 8868 is used by an exempt organization to request an automatic 3-month extension of time (6 months for a Form 990-T corporation) to file its return and also to apply for an additional (not automatic) 3-month extension if the original 3-month extension was not enough time.
About Form 990-BL, Information and Initial Excise Tax Return for Black Lung Benefit Trusts and Certain Related Persons
About Form 990-PF, Return of Private Foundation or Section 4947(a)(1) Nonexempt Charitable Trust Treated as a Private Foundation
About Form 990-T, Exempt Organization Business Income Tax Return (and proxy tax under section 6033(e))
About Form 4720, Return of Certain Excise Taxes Under Chapters 41 and 42 of the Internal Revenue Code
About Form 6069, Return of Excise Tax on Excess Contributions to Black Lung Benefit Trust Under Section 4953 and Computation of Section 192 Deduction
About Form 7004, Application for Automatic Extension of Time To File Certain Business Income Tax, Information, and Other Returns